HomeMy WebLinkAboutITEM VIII-B-3
.September 2006 / / 1 Deleted: 11/16/05
Traffic Circles
DESCRIPTION:
Traffic circles are raised islands constructed at the center of intersections. Treatments include decorative
paving such as stamped asphalt, or landscaping. Traffic circles require drivers to slow to a speed that allows
them to comfortably maneuver around them. Motorists travel in a counter-clockwise direction around the circle.
Traffic circles are "yield upon entry" meaning that vehicles in the circle have the right of way and vehicles
entering the circle must wait until the path is clear. Design Standard will most likely vary between retrofit design
and new construction.
ADVANTAGES:
. Reduces vehicle speed.
. Reduces vehicle conflicts at uncontrolled intersections.
. Provides equal access to intersection for all drivers.
. Does not restrict access to residents.
. Traffic circles can improve the aesthetics of a street.
. Can be used on streets with grade challenges that would prevent other types of treatments such as speed
humps and cushions.
DISADVANTAGES:
. Some curbside parking must be prohibited at each
corner of the intersection.
. May increase emergency response time. The
construction of a mountable curb minimizes this.
. May impact access for large trucks and longer
buses.
. May increase conflicts with cyclist2 and pedestrians.
. May divert traffic to parallel streets.
COST: High ($7500 to $15,000 per each location).
CRITERIA for TRAFFIC CIRCLES:
. Must be installed at an intersection of two Local Streets Only (either T intersection or 4 way)
. Fire and Police must approve the locations, so as to accommodate emergency response.
. 85th percentile speeds on the road are eaual to or in excess of 10 mph over the posted speed limit: OR
Five (5) or more drivers per 24 hour-period are drivina at maximum speeds in excess of 15 mph over
the posted speed limit: OR
Evidence of cut throuah traffic from parallel hiah volume arterials is present: OR
ThE? abQ.l!~giterl~j21J~~flym~LgngJ.!:H;LQ!JY:.~...I[9.fflGEnai neer deems thE1.r.~JQJ:l~_g_~[gr1ifigllJ1..~p'~~gi[)g
problem.
. .40% of residents on street mustpartifip~tElln voting process, 70% of which need to be in support of the /
installation. Boundaries will be identified on a case by case basis and may include residents up to 4
blocks in any direction from the proposed device.
City of Auburn Neighborhood Traffic Calming Program
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. Deleted: <#>85th percentile speeds
on road are equal to or in excess of
10 mph over the posted speed limit;
OR\!
<#>10 or more drivers per 24 hours
driving at maximum speeds in excess
of 15 mph over the posted speed
limit; OR\!
<#>Evidence of cut through traffic
from parallel high volume arterials.\!