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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
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Spot
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-
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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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