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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.
|
Temporary
Installation
N/A
|
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.
|
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.
|
Summary
of Effectiveness
|
Volume
Reduction
|
Yes
|
|
Speed
Reduction
|
Yes
|
|
Safety
Improvement
|
Unknown
|
|
-
|
-
|
|
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 % Trucks
|
Unknown
|
|
Environmental
Changes
|
Unknown
|
|
-
|
-
|
|
Dependence
on Enforcement
|
Some
|
|
Level
of Violation
|
N/A
|
|
-
|
-
|
|
Aesthetics
and Landscaping
|
Possible
|
|
