Traffic Calming

Department of Public Works - Traffic and Transportation Division
Appendix: Physical Traffic Calming Controls

Diagonal Diverter Diagonal diverters are barriers placed diagonally across an intersection, blocking through movement.

Diverters/Plugs Diverters/plugs are islands on approaches to an intersection that block certain movements.	Diverters/Plugs Montgomery County, MD

Traffic Circles Traffic circles are islands, placed in intersections, around which traffic circulates.	Watts Branch Traffic Circle Rockville, MD

Speed Humps/Raised Crosswalks Raised Crosswalks are speed tables outfitted with crosswalk markings and signage to channelize pedestrian crossings, providing pedestrians with a level street crossing.	Speed Humps/Raised Crosswalks Montgomery County, MD

Chicanes Chicanes are curb extensions or islands that alternate from one side of the street to the other, forming S-shaped curves.	Chicanes Huntington Parkway Montgomery County, MD

Intersection Narrowing Intersection narrowings are curb extensions at intersections that reduce roadway width curb-to-curb.

Road Narrowing/Chokers Chokers are curb extensions or islands on one or both sides of the street that narrow the street at that location.