Tools to Address Speeding and Traffic Volumes
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.
- Reduces traffic volume.
- Maintains access for residents.
- Reduces cut-through traffic.
- Reduces crossing distance for pedestrians.
- Landscaping possible.
- OK for emergency vehicles.
- Can provide 2-way access for bicycles.
- May divert traffic to parallel streets.
- May increase trip length for some residents.
- 1-2 curbside parking spaces lost.
- Maintenance needs if landscaped.
|Summary of Effectiveness|
|Streets to Use On Collector, Local||Local/Collector|
|Use on Bus Route||Possible|
|Use with Curbs and Gutters||Yes|
|Spot or Area-wide Use||Spot|
|Emergency Service Access Issues||Yes|
|Impacts on Arterials||Possible|
|Change in % Truck||Unknown|
|Dependence on enforcement||Some|
|Level of Violation||N/A|
|Aesthetics and Landscaping||Possible|