Descriptions and Pictures of
Traffic Calming Devices and Techniques
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Devices and Techniques
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Descriptions
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Pictures
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Bike
Lanes
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A portion of a roadway
which has been designated by striping, signing, and pavement markings
for the preferential or exclusive use of bicyclists.
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![photo: a portion of a roadway which has been designated by striping, signing, and pavement markings for the preferential or exclusive use of bicyclists.](image006.jpg)
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Bulbouts/Neckdowns/
Chokers
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Curb extensions at
intersections that reduce curb-to-curb roadway travel lane widths.
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![photo of curb extensions](image008.jpg)
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Center
Islands
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Raised islands
located along the centerline of a roadway that narrow the width at that
location.
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![photo of raised islands](image010.jpg)
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Chicanes/Lateral Shifts
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Curb
extensions that alternate from one side of the roadway to the other, forming
s-shaped curves.
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![photo of curb extensions that make a road shift directions](image012.jpg)
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Closures
(Cul-de-sacs)
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Barriers
placed across roadways to completely close through vehicle traffic.
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![photo of a cul-de-sac](image014.jpg)
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Diverters
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Barriers placed diagaonally
across an intersection, blocking certain movements.
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![photo of a street barrier](image016.jpg)
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Education
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Instructions
given to the residents on safe on-street vehicle travel.
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![photo of six people at a conference table with a television](image018.jpg)
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Forced Turn
Lanes
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Raised islands
located on approaches to an intersection that block certain
movements.
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![photo of a forced turn lane](image020.jpg)
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Median
Barriers
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Raised islands
located along the centerline of a roadway and continuing through an
intersection to block cross traffic.
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![photo of a median barrier](image022.jpg)
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Police
Enforcement
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Involve
employing the services of law enforcement agencies to impose the local safe
vehicle laws, including those for posted speeds and traffic
signal/signs.
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![photo of a portable traffic speed sign](image024.jpg)
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Realigned
Intersections
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Changes in alignments
that convert T-intersections with straight approaches into curving roadways
meeting at right angles.
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![photo of a road with a "T" intersection](image026.jpg)
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Roundabouts
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Barriers
placed in the middle of an intersection, directing all traffic in the same
direction.
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![photo of a roundabout](image028.jpg)
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Speed
Humps
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Rounded raised
pavement devices placed across roadways to slow and/or discourage
traffic
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![photo of a car moving over a speed hump](image030.jpg)
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Speed
Tables/
Textured
Pavement/
Raised
Crossings
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Flat-topped
speed humps often constructed with a brick or other textured material to slow
traffic
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![photo of a raised crossing](image032.jpg)
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Traffic
Circles
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Barriers
placed in the middle of an intersection, directing all traffic in the same
direction. Usually larger than roundabouts.
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![photo of a traffic circle](image034.jpg)
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