TC - Item 3A - Neighborhood Traffic Management Program - DraftROSEMEAD TRAFFIC COMMISSION
STAFF REPORT
TO: TRAFFIC COMMISSION
FROM: JOANNE ITAGAKI, TRAFFIC ADVISOR
DATE: JANUARY 14, 2010
SUBJECT: NEIGHBORHOOD TRAFFIC MANAGEMENT PROGRAM -TOOLBOX OF
TRAFFIC CALMING MEASURES: DRAFT
SUMMARY
The Traffic Commission and staff continue to develop a Neighborhood Traffic Management
Program that would help to address some of the pedestrian and vehicle issues that
residents bring to the City. This month a Draft of the Toolbox of Traffic Calming Measures
is being presented.
Staff Recommendation
It is staff's recommendation that the Traffic Commission review and discuss the Draft
Toolbox of Traffic Calming Measures to be included in the City's overall Neighborhood
Traffic Management Program.
ANALYSIS
The Draft Toolbox of Traffic Calming Measures was developed using various resource
materials. This included several existing Neighborhood Traffic Calming Programs in the
southern California region and general internet information. The Toolbox is intended to
serve as a menu of traffic calming measures that can be implemented in neighborhoods
throughout the City.
The Draft Toolbox is separated into 3 different levels of "tools". Each level is generally
more restrictive or more costly or requires a longer approval process to implement. Each
tool provides an "Advantages/Disadvantages" list along with an approximate cost. The cost
to implement/install any tool will be dependent on the specific location. The approximate
cost provides the Traffic Commission as well as the City Council and residents an idea of
the implementation/installation cost.
The last section of the Draft Toolbox provides tools that are used in other cities but are not
considered beneficial within the City of Rosemead. Each of these tools, though beneficial,
would likely transfer/redirect traffic concerns to neighboring streets. The application of
these tools within the City was not considered beneficial because of one or more of the
following:
Traffic Commission Meeiing
January 14, 2010
Pace 2 of 2
• The City streets are generally laid out in a "grid" pattern. The use of certain of
these tools would likely transfer speeding and/or cut-through traffic to adjacent
parallel streets.
• The City does not have specific neighborhood entrances.
• The use of these tools would moderately affect emergency response times.
Staff will present a highlight of the various levels of tools within the Toolbox. We will not
review each tool but will answer questions regarding the entire Toolbox.
Submitted by:
Joanne Itagaki
Traffic Advisor
1.~~`
Chris Marcarello
Deputy Public Works Director
Attachment
1) January 2010 Draft Toolbox of Traffic Calming Measures
City of Rosemead
Nei
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A/ I L L D^ A I I yeour xtending
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After approval of toolbox measures,
Neighborhood Traffic Management
include the goals and objectives of 1
the complete development of the
Program (NTMP) will begin. It will
he NTMP, the request process and
other significant information. The toolbox measures will be incorporated
into the complete NTMP as one document.
January 2010 - Draft Q.Ijn 1747013004/Toolbox Measures
LEVEL ONE TOOLS
Generally Administrative/Staff Level Approval
General Characteristics:
• Least restrictive tool
• Easiest to implement
Less potential to shift problem
• Less effect on emergency response
• Lower cost
• Faster to implement
• Lower controversy
List of Level One Tools:
• Education Workshop
• Enhanced Sheriff Enforcement and/or Public Safety Patrol
• Radar Speed Monitoring Trailer
Neighborhood Traffic Watch Program
Higher Visibility Crosswalk
. Pedestrian Crossing Signs
. Radar Speed Feedback Signs
January 2010 -Draft Q.1jn1 74 7013 0 0 4?oolbox Measures
=Education Workshop
Description: Activities that inform and seek to modify driver behavior. Techniques
include printed information, meetings and workshops with staff, interaction
with neighbors, enforcement activities, school programs, public outreach,
etc.
Advantages
Disadvantages
Can be relatively effective and inexpensive.
• Not likely to be as effective on non-
Involves and empowers citizens.
neighborhood traffic.
• Works well with other mitigation tools.
• May be difficult to measure effectiveness.
• Can be time consuming.
. May take time to be effective.
. Effectiveness may decrease over time.
Cost
Low to moderate cost - $200 to $6,000, and is generally measured by man-hours.
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::Enhanced theriff`Enforcement and/or Public Safety. Patrol;
Description: Periodic monitoring of speeding and other violations by Sheriff and/or
Public Safety Patrol.
Advantages
Disadvantages
• Good temporary public relations tool.
. Effect is not permanent.
• Serves to inform public that speeding and
• Enforcement is an expensive tool.
other traffic law violations are undesirable
behavior for which there are conse uences.
Cost
High cost primarily due to the staffing requirements.
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Description: Mobile radar display advises motorists of their speed.
Advantages
Disadvantages
• Good educational tool.
• Requires periodic enforcement.
• Very good public relations tool.
• Effective for limited duration.
• Useful especially in school and construction
. Unit moves frequently which requires
zones where spot speed reduction is important.
personnel.
• Educates drivers on traffic issues in area:
Some drivers may test their speed.
Cost
• Low to moderate cost related to purchase rice and to staffing requirements.
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Neighborhood::Traffic Watch=program
Description: Group of residents volunteer to observe violations and are trained to use
radar units to record and report habitual speeders. Courtesy letters may
be sent by Public Safety officers.
Insert picture
Advantages
Disadvantages
Involves affected residents.
• Requires extensive volunteer citizen
Effective educational tool.
involvement.
May have longer term effects as neighbors
• May need to consider legal and privacy issues.
become aware of who is speeding and the
. Tendency to become very controversial
concerns of other neighbors.
between neighbors.
Cost
Low to moderate cost related to purchase rice of radar units and staffing requirements.
January 2010 - Draft Q:/jn1 74 7 013 0 0 4/Toolbox Measures
Definition: Crosswalk treatments which increase driver awareness of pedestrian
activities. Higher visibility crosswalks should only be used at uncontrolled
crosswalks. They would ordinarily be placed where a significant volume of
pedestrian activity has been identified.
Advantages
Disadvantages
• Relative low cost.
• Can induce a greater false sense of security in
• Can be effective at increasing driver
the pedestrian.
awareness.
• Lower visibility crosswalks may be ignored by
• Can be incorporated into other roadway
drivers.
features such as chokers.
Cost
• Higher visibility crosswalks cost $1,000 to $5,000, depending on the design technique, some
additional maintenance costs.
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?Pedestrian Crossing Signs .
Definition: Signs placed in the roadway median at marked crosswalks that advise
motorists of the pedestrian right-of-way.
Insert
picture
Advantages
Disadvantages
Relative low cost.
Proliferation of such signs would tend to
Brings motorists attention to crosswalk and
diminish effectiveness.
pedestrian activity.
Motorists may stop when no pedestrians are
May result in slower speed near the
present.
crosswalks.
Cost
Low to moderate cost related to purchase and installation rice of sign.
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Radar Speed Feedbadk'Sign _
Description: Pole mounted radar display advises motorists of their speed.
Advantages
Disadvantages
• Improves speed limit sign awareness.
• If posted speed is not close to the speed
• Alerts drivers to excessive speeding
preferred by drivers, additional enforcement
Helps reduce speeds near high activity zones
may be necessary
including schools.
Proliferation may reduce effectiveness
Is not easily moved.
Cost
Moderate cost- $15,000-$20,000.
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LEVEL TWO TOOLS
Generally Approved by Traffic Commission and/or City Council
General Characteristics:
• Moderately restrictive tool
• Greater affect on emergency response
• Greater potential to shift problems
Higher cost
More complex approval process
List of Level Two Tools:
• Traffic Signal Adjustments to Discourage Cut-through Traffic
• Turn Restrictions via Signage
• Rumble Strips/Dots
• Crosswalk Warning System/In-Roadway Warning Lights
• Raised Center Median
• Chokers at Intersections
• Mid-block Narrowing
• Lane Narrowing/Lane Reduction - Striping
Textured Pavement
Parking Restrictions
January 2010 - Draft Q.Jn1747013004?oolbox Measures
Description: Adjustment of traffic signals to prohibit or restrict turning or through
movements which may be accompanied by a sign indicating specific days
and/or hours of applicability.
Insert picture
Advantages
Disadvantages
• Significant exclusion of undesired movements
• Prohibition is subject to some deliberate
may have a significant positive impact on
violation, particularly at low volume local
residential area.
intersections within the neighborhood where
• In case of turn prohibitions, safety may
sheriff presence is infrequent.
increase on origin streets (often a major or
• Safety may decrease at other locations if
non-local).
drivers are forced to make hazardous
• Does not impede emergency vehicles, as they
movements to compensate for restricted
can readily violate the restriction.
movements.
Cost
• Low to moderate cost related to purchase and installation price of sign and possible traffic signal
modifications.
January 2010 -Draft Q.#0 74 7013 0 04/Toolbox Measures
Description: Turning prohibitions or restrictions may be accompanied by a sign panel
indicating specific targeted days and/or hours of applicability. A
combination of these signs may appear at a location, depending on which
movement(s) is (are) intended for exclusion.
Insert picture
Advantages
Disadvantages
• Significant exclusion of undesired movements
• Prohibition is subject to some deliberate
may have a significant positive impact on
violation, particularly at low volume local
residential area.
intersections within the neighborhood where
• In case of turn prohibitions, safety may
sheriff presence is infrequent.
increase on origin streets (often a major or
• Safety may decrease at other locations if
non-local).
drivers are forced to make hazardous
• Does not impede emergency vehicles, as they
movements to compensate for restricted
can readily violate the restriction.
movements.
Cost
• Low to moderate cost related to purchase and installation price of sign(s .
January 2010 - Draft Q:/jn1 7 4 7013 0 0 4/Toolbox Measures
.-Rumble Strips/Dots-
Description: Rough or patterned section of pavement, created by asphalt strips or
raised ceramic pavement markers for the purpose of alerting drivers of a
specific control device (e.g. marked unprotected crosswalk) or a
particularly unique conditions (e.g. sharp curve).
Insert picture
Advantages
Disadvantages
May reduce speed in localized area.
• Creates noise and vibration to neighboring land
Raises motorists awareness.
uses.
Bicycles/motorcycles may have difficulty
crossing rumble strips.
Cost
Low initial cost. Moderate to high maintenance cost requirements.
January 2010- Draft Q:/jn1 74 7 013 0 041Tootbox Measures
Description: Lights embedded in the pavement at uncontrolled pedestrian crossing
which flash to alert the on-coming motorist when a pedestrian may be
crossing.
Advantages
Disadvantages
• Much higher visibility to motorists than
• Pedestrians may develop a false sense of
standard crosswalk,
security.
• Visible at night and during haze and fog
• Less visible during daytime.
conditions.
Pedestrians may not wait for vehicles to stop.
• Provides additional visibility for slower and/or
• Effectiveness may wear off over time.
young pedestrians.
Cost
• High cost - $15,000 to $50,000 per application.
January 2010 -Draft Q:/jn1 74 7 013 0 0 4/Toolbox Measures
Raised Center Median
Definition
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PLAN VIEW
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traffic.
Advantages Disadvantages
Provides a refuge for crossing pedestrians. • Long medians interrupt emergency access and
• May improve streetscape if landscaped. operations.
Provides barrier between lanes of traffic. May reduce sight lines if over landscaped.
Acts as entranceway into neighborhood. Increased maintenance.
May produce a limited reduction in vehicle Forces vehicle traffic closer to homes.
speeds. May require removal of on-street parking.
• Discourages non-resident traffic. May interrupt driveway access adjacent to
median.
• Can impact bicycle use.
Long medians can interrupt emergency access
and operations.
• Additional utility requirements (water, power).
Cost
• Medians can cost from $10,000 to $30,000 depending on size and landscaping treatment
January 2010 - Draft Q.#n17470130041Too1box Measures
neighborhoods.
1.
PLAN VIEW
Advantages
Disadvantages
• May be aesthetically pleasing, if landscaped.
• Unfriendly to bicyclists unless designed to
• Good for pedestrians due to shorter crossing
accommodate them.
distance.
• Landscaping may cause sight line problems if
Can be used in multiple applications or on a
not maintained.
single segment of roadway.
Increased maintenance if landscaped.
• Creates neighborhood "gateway".
• Drainage issues need to be resolved.
• Impacts on-street parking.
Cost
• Moderate to high cost depending on landscaping, pavement treatments and storm drainage
considerations - $5,000 to $15,000.
January 2010 - Draft Q.1jn1 74 7013 0 0 4/Too/box Measures
Definition: Physical curb reduction of road width at intersections. A widening of street
corners at intersections to discourage cut-through traffic and to help define
Description: Street physically narrowed to expand sidewalks and landscaped areas.
(Similar to chokers but used at mid-block.)
PLAN VIEW
Advantages
Disadvantages
• When used at crosswalk, pedestrian visibility
• Creates drainage issues where curb and gutter
increased and crossing distance reduced.
exist.
• May reduce speed by narrowing usable street
• Unfriendly to bicyclists unless designed to
width.
accommodate them.
Minor inconveniences to motorists.
• May require removal of parking.
• Minimal inconveniences to local traffic.
• Only partially effective as a visual obstruction.
• Opportunity for landscaping and visual
• Can restrict driveway access.
enhancement.
• Effective when used in a series.
Cost
Moderate to high cost depending on length of narrowing - $10,000 to $50,000.
January 2010 -Draft Q.# 1 74 7013 0 0 41Toolbox Measures
Definition: Highlighting various areas of the road to increase the driver's awareness
of certain conditions (e.g., edge of road striping to create a
narrowing/slowing effect while defining space for bicyclists).
January 2010 -Draft Q:Qn1 7 4 7013 0 0 4/Tootbox Measures
Textured Pavement.
Advantages
Disadvantages
• May be aesthetically pleasing.
• May be used to define pedestrian crossin .
Increased maintenance.
May will increase ambient noise.
Cost
• Textured pavements cost approximately $5,000 to $40,000
January 2010 - Draft Q.'# 1747013004/Toolbox Measures
Definition: A change in pavement texture (e.g., asphalt road to brick crossing) that
helps to make drivers aware of a change in the driving environment.
Pairkillig Restrictions -
Definition: (One or more of the following): 1. Metered parking with a maximum time
limit. 2. Limited parking hours on streets. 3. Prohibited over-night parking
on streets.
Insert picture
Advantages
Disadvantages
• Reduces "outsider" parking in residential areas.
• Depending on the posted restrictions, may not
• Can reduce inconvenience to residents and
eliminate all customer parking in residential
business owners associated with simple time
areas abutting retail districts.
limit parking.
• Does not allow residents to park on streets
• Increases short term parking availability near
over-night.
retail districts.
Cost
• Low to moderate depending on the chosen option.
January 2010 -Draft QYjn1 74 7013 0 0 4/rootbox Measures
LEVEL THREE TOOLS
Requires Traffic Commission and/or City Council Approval
General Characteristics:
• Moderately restrictive tool
• Strong potential to affect emergency response
• Strong potential to shift problems
• Generally the highest cost
• Must be considered only after Level One and Two tools have been reviewed
and/or tested in the field.
List of Level Three Tools:
Raised Crosswalk
•
Raised Intersection
Traffic Circle
•
Restricted Movement Barrier
•
Entrance Barrier- Half closure
Partial Street Closure - Forced Turn Barrier
•
Diagonal Diverter
•
Full Street Closure (Cul-de-sac)
One-Way Street
Roadway Narrowing - Curb Extensions
Roadway Narrowing - Chokers
•
Roadway Narrowing - Angle Parking
•
Landscaping - Parkway
•
Landscaping - Raised Center Median
•
Enforcement- Red Light Photo
January 2010 - Draft Q.1jn1 74 7013 0 04/Tootbox Measures
Ra -k6d Crosswalk _I
Advanta es
Disadvantages
Effective speed control at the installation.
May create noise, particularly if there are loose
• Effective pedestrian amenity.
items in the vehicle or trailer.
• May be designed to be aesthetically pleasing.
May be a problem for emergency vehicles.
•
May impact drainage.
Drivers may speed up between humps.
May increase volumes on other streets.
•
Requires signage that may be considered
unsightly.
Cost
Moderate to high depending on location.
January 2010 - Draft Q:/jn1747013004/Toolbox Measures
Definition: A speed hump designed as a pedestrian crossing, generally used at mid-
block locations.
Definition: A raised plateau where roads intersect. The plateau is generally 3" above the
surrounding street.
Advantages
Disadvantages
• Slows vehicle in the most critical area and
Increased difficulty of making a turn.
therefore helps to make conflict avoidance
Increased maintenance.
easier.
• Requires adequate signage and driver
• Highlights intersection.
education.
• Can reduce auto/pedestrian conflicts.
• More costly than speed humps.
• Aesthetically pleasing if well designed.
• Effective speed reduction, better for emergency
vehicles than speed humps.
Cost
• Moderate to high cost - $8,000 to $15,000 depending on intersection size.
January 2010 - Draft Q.1jn 1 7 4 7013 0 0 4/TooIbox Measures
Definition: Traffic circles are raised circular medians in an intersection. Vehicles
must change their travel path to maneuver around the circle. Drivers
travel in a counter-clockwise direction around the circle. Traffic circles and
roundabouts are generally "yield upon entry," meaning that cars in the
circle have the right-of-way and cars entering the circle must wait to do so
until the path is clear.
Advantages
Disadvantages
• Slows traffic as motorists drive around circle.
• May impede emergency response.
• Breaks up sight-lines on straight streets.
• May impede left turns by large vehicles.
• Opportunity for landscaping in the intersection.
Bicycles must merge with vehicle traffic around
circle.
• May shift traffic to parallel residential streets.
• Ma require some parking removal.
Cost
• Moderate to high cost - $5,000 to $10,000 depending on intersection size.
January 2010 - Draft Q:/jn1747013004/Tootbox Measures
Definition: Physical blockage of one direction of traffic on a two-way street. The open
lane of traffic is signed "one way," and traffic from the blocked lane is not
allowed to go around the barrier through the open lane.
Advantages
Disadvantages
• Reduces through-traffic in one
direction
•
Reduces access for residents.
and possibly in the other.
Emergency vehicles are only partially
• Allows two-way traffic in the remainder of
affected as they have to drive around
the street.
partial closure with care.
• Good for pedestrians due to
shorter
.
Compliance with semi-diverters is not 100
crossing distance.
percent.
• Provides space for landscaping.
•
May increase trip length for some
• Can be designed to provide
two-way
residents.
access for bicycles.
Maintenance increased if landscaped.
Cost
• Moderate cost - $7,000 to $15,000.
January 2010 - Draft Q:407470130041Toolbox Measures
Entrarice Barrier Half Closure
Definition: Physical barrier that restricts turns into a street. This barrier creates a
one-way segment at the intersection while maintaining two-way traffic for
the rest of the block.
Insert picture
Advantages
Disadvantages
• Effectively restricts movements into a
• May divert traffic to other local streets.
street while maintaining full access and
• May increase trip length for some
movement within the street for residents.
motorists.
• Redirects traffic to main streets.
Overly restrictive if cut-through problem
• Self enforcing, unlike signage only.
exists only at certain times of day.
• Reduces cut-through traffic.
May need to implement on several parallel
• Increases opportunity for landscaping in
streets to prevent diversion issue.
the roadway.
• May have little effect on speeds for local
traffic.
• May negatively affect emergency
response.
Cost
• Moderate to high cost - $8,000 to $18,000.
January 2010 - Draft Q.#07470130041Toolbox Measures
Definition: Small traffic islands installed at intersections to channel turning
movements.
Advantages
Disadvantages
• Changes driving patterns.
May increase trip lengths for some divers.
• May reduce cut though traffic.
• Can be aesthetically unattractive if not
• May be attractive if landscaped.
landscaped.
• May increase response times for
emergency vehicles.
• Maintenance increased if landscaped.
Cost
• Moderate to high cost - $8,000 to $18,000.
January 2010 -Draft Q.Ijn1 74 7013 0 0 4/rootbox Measures
- -
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U cdALDlverter
Definition: A barrier placed diagonally across a four-legged intersection, interrupting
traffic flow across the intersection. This type of barrier may be used to
create a maze-like effect in a neighborhood.
PLAN VIEW
Advantages
Disadvantages
•
Eliminates through traffic.
May inconvenience residents gaining access to
Provides area for landscaping.
their properties.
•
Reduces traffic conflict points.
•
May negatively affect emergency response.
•
Increases pedestrian safety.
•
May divert through traffic to other local streets.
•
Can include bicycle path connection.
•
Altered traffic patterns may increase trip length.
•
Reduces cut-though traffic.
•
Corner properties must be protected from
•
Self enforcing unlike signage only.
violators.
•
Overly restrictive if cut-though problem exists
only at certain times of the day.
Cost
•
Moderate to high cost - $10,000 to $30,000.
January 2010 - Draft Q:/jn1747013004?oolbox Measures
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Definition: Street closed to motor vehicles using curbs, planters, bollards, barriers,
etc.
Advantages
Disadvantages
• Eliminates through traffic.
Reduces emergency vehicle access.
• Reduces speed of the remaining vehicles.
Reduces access to properties for residents.
Reduces potential conflicts for street users.
• May be perceived as inconvenient by some
• Pedestrian and bicycle access maintained.
neighbors and an unwarranted restriction by
the general public.
• May increase trip lengths.
• May increase volumes on other streets.
Cost
• Moderate to high cost - $10,000 to $30,000
January 2010 - Draft Q:/jn1747013004?oolbox Measures
Advantages
Disadvantages
• Tends to reduce vehicle conflicts due to lack
• Can lead to increased vehicle speeds.
of friction from opposing traffic flow.
. May result in longer trip lengths.
Can facilitate traffic flow through an area.
May increase emergency response time.
• Can open up narrow streets for more resident
May increase volumes on other streets.
parking.
Initial safety concerns as drivers adjust.
• Maintains reasonable access for emergency
Can induce intentional violations by residents.
vehicles.
• Maze effect of one-way traffic can discourage
through traffic.
• May facilitate increased parking opportunities
through angle parking.
Cost
Moderate - The cost associated with designing certain roadways within a neighborhood as one-way
streets would be in the $2,000 to $4,000 range per street plus construction costs.
January 2010 - Draft Q:/jn1747013004/Toolbox Measures
Definition: Self-explanatory. (Changing the traffic flow pattern with one-way streets
should be considered only in areas where there is a documented high
percentage of cut-through traffic and where alternative routes exist.)
PLAN VIEW
Advantages
Disadvantages
• Minor inconveniences to drivers.
• Only partially effective as a visual obstruction.
• Minimal inconveniences to local traffic.
Unfriendly to bicyclists unless designed to
• Good for pedestrians due to shorter crossing
accommodate them.
distance.
• Drainage issues need to be resolved.
• Provides space for landscaping.
• Restricts on-street parking.
• Slows traffic without seriously affecting
• Can restrict driveway access.
emergency response time.
• Effective when used in a series.
Cost
• Moderate to high cost - $7,000 to $10,000.
January 2010 - Draft Win1747013004/Toolbox Measures
Definition: Street physically narrowed to expand sidewalks and landscaped areas.
(Similar to chokers but used at mid-block.)
Roadway Narrowing Chokers ,
Definition: Physical curb reduction of road width at intersections. Similar to curb
extensions but used at intersections.
PLAN VIEW
Advantages
Disadvantages
May be aesthetically pleasing, if landscaped.
Unfriendly to bicyclists unless designed to
• Good for pedestrians due to shorter crossing
accommodate them.
distance.
Landscaping may cause sight line problems if
• Can be used in multiple applications or on a
not maintained.
single segment of roadway.
Increased maintenance if landscaped.
• Creates neighborhood "gateway".
Drainage issues need to be resolved.
Impacts on-street parking.
Cost
Moderate to high cost depending on landscaping, pavement treatments and storm drainage
considerations
January 2010 - Draft Q.J 1 74 7013 0 0 4/Toolbox Measures
Definition: Highlighting various areas of the road to increase the driver's awareness
of certain conditions (e.g., edge of road striping to create a
narrowing/slowing effect while defining space for bicyclists).
%
PLAN VIEW
Advantages
Disadvantages
• Inexpensive.
May not be as effective as other more
• May reduce speed.
structured techniques.
• Edge treatment reduces potential vehicle
conflict with bicyclists and pedestrians.
• Low maintenance.
Cost
• Moderate initial cost and ongoing maintenance
January 2010 - Draft Q.Ijn1747013004/7oolbox Measures
Landscaping - Parkway
Definition: Self-explanatory.
Advantages
Disadvantages
• Can reduce vehicle speeds.
Can be costly to maintain.
Alters the nature of the roadway.
Can interfere with angle parked vehicles.
• Is pedestrian friendly.
May reduce effectiveness of street lighting.
• Increased aesthetics.
Can interfere with sight visibility.
cost
The cost associated with landscaping varies widely based on the type and extend and can range from
$10,000 to $200,000 or more.
January 2010 - Draft Q.Ijn 17470130041'roolbox Measures
-Landscaping - Raised CenterMedian' `
Advantages
Disadvantages
• Can reduce vehicle speeds.
Alters the nature of the roadway.
Can include pedestrian facilities.
• Increased aesthetics
• Can be costly to maintain.
• Can interfere with sight visibility.
Cost
The cost associated with landscaping varies widely based on the type and extent and can range from
$10,000 to $200,000 or more.
January 2010 - Draft Q:1jn1 74 70/3 0 0 41Toolbox Measures
Definition: Self-explanatory.
Definition: Automated enforcement of red light violations at traffic signalized
intersections.
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Advantages
Disadvantages
Increases availability of law enforcement
Can result in loss of funds if not effective
personnel for other duties
May be installed at little or no initial cost to
the City.
Can be effective in reducing vehicle speeds.
Increases intersection safety.
May generate additional revenue.
Cost
Moderate to high cost - $25,000 - $50,000 per direction
January 2010 - Draft Q:/jn 1747013004/Toolbox Measures
TOOLS USED IN OTHER CITIES
Informational
The tools listed here are not likely to be used in the City of Rosemead. Each tool has its
advantages/disadvantages listed as in the previous sections: However, their application
within the City was not considered beneficial because of one or more of the following:
The City streets are generally laid out in a "grid" pattern. The use of certain
of these tools would likely transfer speeding and/or cut-through traffic to
adjacent parallel streets.
The City does not have specific neighborhood entrances.
The use of these tools would moderately affect emergency response times.
List of Tools Used in Other Cities:
• Roundabout
• Gateway Treatment
• Speed Hump
• Speed Table
January 2010 - Draft Q.Ijn 1747013004/Toolbox Measures
Definition: Roundabouts are raised circular areas (similar to medians) placed at
intersections and are larger than traffic circles.
Advantages
Disadvantages
• May reduce potential vehicle conflicts.
• May be restrictive for larger vehicles if
• Reduces speed at intersection approach.
designed to a low speed. Providing a
Provides space for landscaping.
mountable apron minimizes this limitation.
• Effective at multi-leg intersections.
• May require additional lighting and signage.
• Provides equal access to intersections for all
• If left turns by large vehicles are to be
drivers.
accommodated then right-of-way may have to
Does not restrict movements, but makes them
be purchased.
more difficult.
Initial safety issues as drivers adjust.
• May increase volumes on adjacent streets.
• Maintenance increased if landscaped.
• May increase vehicle/pedestrian conflicts.
• May not be bicycle friendly.
Cost
• High cost - $30,000 to $50,000
January 2010 - Draft Q:/jn1747013004/Toolbox Measures
Definition: Treatment to a street that includes a sign, banner, landscaping or other
structure that helps to communicate a sense of neighborhood identity:
PLAN VIEW
Advantages
Disadvantages
•
Positive indication of a change in
.
Maintenance increased if landscaped.
environmental from arterial road to residential
.
Not friendly to bicycles.
area.
May impact on-street parking.
•
Reduces entry speed.
.
May interrupt emergency access and
•
Reduces pedestrian crossing distances.
operations.
•
On wide streets provides space for landscaping
the median.
Helps give neighborhood a sense of identity.
•
Allows neighborhood creativity and
participation in design.
May discourage cut-through traffic.
Cost
•
Moderate cost - $5,000 to $10,000.
January 2010 -Draft Q:/jn1 74 7013 0 04/Toolbox Measures
Definition: Speed Humps are wave-shaped paved humps in the street. The height of
the speed hump determines how fast it may be navigated without causing
discomfort to the driver or damage to the vehicle. Discomfort increases as
speed over the hump increases. Typically speed humps are placed in a
series rather than singularly.
dvanta es
Disadvantages
le speeds in the viciniof the
May create noise particularl y if there are loose
f used in a series at 300' to 500'
items in the vehicle or trailer.
r
If not properly designed, drivers may try to skirt
around to avoid impact.
Relatively
ensive.
May delay emergency vehicles.
• May impact drainage.
• Drivers may speed up between humps.
• Difficult to properly construct.
• Requires signage that may be considered
unsi htl .
Cost
• Speed humps and tables cost approximately $2,000 to $2,500 each (minimum $6,000 for a series).
January 2010 - Draft Q:/jn1 74 7013 0 0 4/Toolbox Measures
Definition: Speed Tables are similar to speed humps in overall height. The basic
difference between speed tables and speed humps are their lengths.
Speed tables are typically 22 feet in length with the 3-inch rise occurring
over the first 6 feet on either the arrival or departure side with the center
10 feet being flat.
Advantages
Disadvantages
Reduced vehicle speeds in the vicinity of the
May create noise particularly if there are loose
table. Better if used in a series at 300' to 500'
items in the vehicle or trailer.
spacing.
If not properly designed, drivers may try to
Self enforcing.
skirt around to avoid impact.
Relatively inexpensive.
May delay emergency vehicles.
May be installed on "collector" streets
May impact drainage.
May be installed in streets with prima facie 30
Drivers may speed up between tables.
mph speed zones.
Difficult to properly construct.
Requires signage that may be considered
unsightly
Cost
• Speed humps and tables cost approximately $2,000 to $2,500 each (minimum $6,000 for a series).
January 2010 - Draft
Q.1jn1747013004/Tootbox Measures