engineers and planners responded with… traffic calming context sensitive design
TRANSCRIPT
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Engineers and Planners responded with…
Traffic Calming
Context Sensitive Design
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Learning from History: The old way
Traffic calming adds some new tricks to our bag of design options but….
We can learn a lot about designing good roads by looking at the old way of design
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the old way1. Roads fitted the context
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Traffic Calming
Contribute to livability and multimodal transportation by limiting speed and/or
volume of vehicular traffic
And to our health according to the USA Today….
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Bicycling Commuting and Traffic Calming
Very few people commute by bikes in the USA…
Modal Split for Bikes
USA
Germany
Netherlands
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Bicycling Commuting and Traffic Calming
… except in a few places with the facilities
Modal Split for Bikes
USA
Davis, CA
Germany
Netherlands
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Bicycle Safety and Traffic Calming…. the rate of fatality per trip in USA is very high
Bicycle Fatality Rate per Million Trips
USA
Germany Netherlands
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Pedestrian Safety and Traffic Calming Percentage of Pedestrians Killed Doubles for Each 5 mph Increase in
Speed(USDOT – National Highway Safety Administration,1999)
010203040506070
<20 21-25 26-30 31-35 36-45 46+
Travel Speed, mph
Perc
ent o
f Ped
s Ki
lled
All Peds
Elderly
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Traffic Calming Measures vertical deflection (speed humps, raised pedestrian crosswalks and
intersections)
narrow traffic lanes small turning radii at intersections extensions to the pedestrian realm (raised
crosswalks and intersections and curb extensions) chicanes roundabouts and traffic circle Diverters and Closures bike lanes and bike boulevards
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Vertical Deflection
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Portland DOT Speed Study 14 ft Bumps http://www.trans.ci.portland.or.us/trafficcalming/reports/reports.htm
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Portland DOT Speed Study 14 ft Bumps http://www.trans.ci.portland.or.us/trafficcalming/reports/reports.htm
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Portland DOT Speed Study 22 ft Bumps http://www.trans.ci.portland.or.us/trafficcalming/reports/reports.htm
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Portland DOT Speed Study 22 ft Bumpshttp://www.trans.ci.portland.or.us/trafficcalming/reports/reports.htm
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Narrow Traffic LanesPortland, Or
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Narrow Traffic LanesWest Hartford
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Extensions to the Pedestrian Realm
Trinity College, Hartford
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Extensions to the Pedestrian Realm
Portland, Or
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Extensions to the Pedestrian Realm
Durham, New Hampshire
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Chicane
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Traffic Circle
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Traffic Circle
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DiverterBerkeley, California
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DiverterBerkeley, California
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Bike BoulevardBerkeley, California
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Bike BoulevardBerkeley, California
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Traffic Calming Design for Emergency Vehicles
http://www.trans.ci.portland.or.us/trafficcalming/Emergency/emergency.htm
Two of the main traffic calming devices potentially affecting emergency vehicle operations are bumps and traffic circles.
Portland (Oregon) DOT has done extensive research on emergency vehicles and traffic calming.
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Emergency Vehicles and Traffic CalmingTraffic calming slows down all
vehicles including emergency response vehicles – this is a potential problem when there is an extensive system of traffic calming devices.
However, it should be pointed
out that a properly designed network should compensate for lower speeds because routes are generally shorter.
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Traffic Calming Design for Emergency Vehicleshttp://www.trans.ci.portland.or.us/trafficcalming/Emergency/emergency.htm
Changes that have been made in the Portland traffic calming regulations to better accommodate emergency vehicles
Add ‘emergency response route’ to road types in Portland DOT functional classification
Split (or offset) bump
Another good site for traffic calming and emergency vehicleshttp://www.cwdnet.com/qlc/tc_emergency_padot.htm