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HALF CLOSURES AND SEMI-DIVERTERS
Semi-diverters are extensions from the curb or islands - usually extending from a corner of an intersection that block one directional lane of the street.
They are used to prevent drivers from making certain turn movements at an intersection. Semi-diverters can effectively reduce traffic volumes on a street although the diverted traffic may impact adjacent streets. Semi-diverters are very effective in reducing volumes at specific locations.
Semi-diverters affect all drivers, including local residents. Thus, care must be taken to consider the impacts on alternative routes as well as neighborhood access routes.
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Temporary Installation
N/A
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Permanent Installation
Culver City, CA |
PROS
1. Reduces traffic volume.
2. Maintains access for residents.
3. Reduces cut-through traffic.
4. Reduces crossing distance for pedestrians.
5. Landscaping possible
6. OK for emergency vehicles.
7. Can provide 2-way access for bicycles.
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CONS
1. May divert traffic to parallel streets.
2. May increase trip length for some residents.
3. 1-2 curbside parking spaces lost.
4. Maintenance needs if landscaped.
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Summary of Effectiveness
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Volume Reduction
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Yes
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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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Possible
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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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Yes
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Impacts on Arterials
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Possible
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Change in % Trucks
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Unknown
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Environmental Changes
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Unknown
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-
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-
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Dependence on Enforcement
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Some
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Level of Violation
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N/A
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-
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-
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Aesthetics and Landscaping
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Possible
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