Traffic Calming Measures by Roadway Type

Speed Control Measure	Arterial	Residential
Police Enforcement	yes, enhanced	yes, routine
SMART trailer (flashing speed display)	yes, 2 lane roadways only	yes
Traffic Circles	yes, if designed to accommodate full movements by trucks and buses	yes, retrofit design
Speed Humps	no	generally yes
Curb Extensions	yes	yes
Median or Pedestrian Refuge Island	yes	yes
Edgelines to narrow wide roadway to create parking lane or shoulder	yes	yes

NOTE: Volume control measures are not used on arterial roadways and are considered on residential roadways only in accordance with Section 31-49, Residential Traffic Management Areas, Montgomery County Code 1994 and Executive Regulation 17-94AM.