SR-506-003-05 (13)
ATTACHMENT H
966
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City of Portland, Oregon, Rubber Speed Bump http://www.trans.ci.portland.or.usl...icCalminglDeviceslSpeedlrubberl.htm
Rubber
_ Speed Bumps
The City of Portland joined forces with Recycled Technology, ofTualatin, in September of 1995, initiating
development of a rubber speed bump for use on streets with frequent maintenance needs. Since that time,
many uses have been identified.
Use Rubber Speed Bumps:
· on residential streets to improve neighborhood livability.
· in construction work zones to create safer work sites and reduce flag personnel.
· at high or 'at risk' pedestrian locations like street fairs and school crossings.
· in parking lots where traditional bumps only cause discomfort to the slow vehicles.
Rubber Speed Bump Benefits:
Planning and Design
· Speed bumps slow traffic without reducing access.
· Test a bump layout before permanent asphalt construction.
· Adjust a bump layout after first installed - try that with asphalt!
· Discourage infiltration of traffic diverting from a street under construction
Construction
· Repeatedly uniform shape that is difficult to achieve with asphalt.
· Extends construction season - rubber bumps don't require warm weather.
· Consistent installation regardless of labor skill level.
· Reduced manpower and equipment.
Maintenance
· Street resurfacing easily accommodated - unbolt the bump, resurface, and put the rubber bump back.
· Wom ramp sections can be exchanged with sections not in the wheel path.
· Inlaid markings are possible.
Temporary Uses
· Slow vehicles in construction zones.
· Use during street fairs, or other high pedestrian activity events, to slow nearby vehicles.
Testing Protocol:
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City of Portland, Oregon, Rubber Speed Bump http://www.trans.ci.portland.or.us!... icCalming/Devices!Speedlrubber 1.htm
Phase One of the development contract tested the
durability of Recycled Technology's rubber material to
withstand traffic. Phase One testing took place at the
Stanton maintenance yard, Kerby Street entrance. Mats of
the rubber compound were placed on a 10% downhill
grade where heavy truck traffic entered the yard. The site
was chosen to accelerate fatigue of the materials. This test
also allowed evaluation of different techniques to attach
the rubber material to the road.
Phase Two of the development contract placed fu 1 size
prototype rubber bumps on city streets to evaluate the
design, comfort and effectiveness of the device. I
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he graph below compares the effectiveness ofthe rubber bumps to asphalt bumps at reducing tra fie
pee.
r:. Approach and Depart Speeds
Q. 14 foot Spee d Bumps
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~ 20
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r:. -200 -100 0 100 200
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ID Distance To(-) and Past (+) Speed Bump
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- Rubber Test #1 '7 Rubber Test #2
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The first prototype was installed on SE Martins Street in April of 1998. This installation was a temporary
test and the device has since been removed.
The second rubber bump was tested on NE 72nd Drive, north of Tillamook Street. It was installed July 25,
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City ofportland, Oregon, Rubber Speed Bump http://www.trans.ci.portland.or.us/... icCalming/Devices/Speedlrubber 1 .htm
1998. This speed bump was constructed as part of pedestrian improvements being constructed by the
Parks Bureau on NE 72nd Drive, which bisects the Rose City Golf Course. This bump is one of four
bumps in a series (the others are asphalt) and is scheduled to be left in place indefinately.
The most recent installation is on SE 72nd Avenue, aylor
to Division. This street has had utility work conflict
which have delayed resurfacing and asphalt bump
construction. Six rubber speed bumps where install d on
an interim basis until the utility work is complete an the
street can be resurfaced.
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~or additional product For City comments and the sfatus
of ritv tpdino l'ont~l'to
onformation and pricing* contact: -- '-"&",J ...-,.",...........b --.........--....
cled Technolo email: Scott Batson
ec City of Portland
800.455.6287 or 503.691.5845
*The City of Portland will receive a royalty for each rubber ramp sold by Recycled Technology.
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