Traffic Calming Criteria for Speed Tables

Below is the Traffic Calming Criteria employed to determine the need for the installation of traffic calming devices such as speed tables.  The criteria was based on the Traffic Calming Analysis Methodology as provided on Section 2.0 of the Village-wide Traffic Master Plan, which was approved by the Village Council with the adoption of Resolution No. 2018-20.  Please click the link below to read the Village-wide Traffic Master Plan in its entirety.


 

TRAFFIC CALMING CRITERIA

Determination:


  • 2.0 total points:  a traffic study is required to determine whether the area is eligible for traffic calming device(s).
  • 2.5 total points or greater:  area automatically qualifies for traffic calming device(s).

Criteria 1.  Speed



 Points  Speed*(mph)
 0.5 less than 4.6 mph
 1.0  4.6 to 7.5 mph
 1.5  7.6 to 10.5 mph
 2.0  17.6 to 13.5 mph
 2.5  13.6 to 16.5 mph
 3.0  more than 16.5 mph
*85th percentile speed is above the posted speed limit.  The 85th percentile speed is defined as "the speed that is exceeded by 15% of the motorists surveyed.

Criteria 2.  Number of Accidents



 Points  Number of Accidents
 0.5 1 - 2 
 1.0 3  
 1.5 4 or more 

Criteria 3.  Traffic Volume


 
 Points Volume*
 0.5 500 - 700 vehicles 
 1.0  751 - 1,100 vehicles
 1.5  1,101 - 1,700 vehicles
 2.0  1,701 - 2,300 vehicles
 2.5  more than 2,300 vehicles
*Number of vehicles within a 24-hour period.

Criteria 4. Other



 Points Other Criteria 
 0.5 if no sidewalks exist on either side of the street