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RADAR
TRAILER
These mobile devices
display the drivers travel speed on a large display along with the posted
speed limit. Their goal is to encourage compliance.
Their effectiveness tends to be limited to the times when they are displayed
- with minimal effect on speed when they are removed. A drop in speed
of 25 percent is possible with the devices when displayed.
After a series of applications an overall drop in speed of about 6 percent
has been found when traffic volumes are less than 600 vehicles per day.
On higher volume streets their impact has been found to be negligible.
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Temporary
Installation
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Permanent
Installation
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PROS
1.
This tool can be effective when displayed and may improve
effectiveness with multiple applications on lower volume streets
(<600 vpd).
2. May be popular with residents.
3. Low cost measure.
4. Can be used with Speed Alert Program.
5. Easily deployed.
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CONS
1.
Minimal effectiveness when device is removed.
2. Minimal long-term impact on travel speeds.
3. Requires staff time to & from location to location.
4. Subject to vandalism.
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Summary
of Effectiveness
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Volume
Reduction
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No
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Speed
Reduction
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Yes
|
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Safety
Improvement
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Unknown
|
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-
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-
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Streets
to Use On – Collector, Local
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Local/Collector
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Use
on Bus Route
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Yes
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Use
with Curbs and Gutters
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Yes
|
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Spot
or Area-wide Use
|
Spot
|
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-
|
-
|
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Emergency
Service Access Issues
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No
|
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Impacts
on Arterials
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Unlikely
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Change
in % Trucks
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Unknown
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Environmental
Changes
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No
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-
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-
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Dependence
on Enforcement
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No
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Level
of Violation
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Low
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-
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-
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Aesthetics
and Landscaping
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No
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Return to Raised Crosswalks
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