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Case Study

Bicycle Signal Detector Loops, Madison, WI

City: Madison
State: WI
Associated Publication: Urban Bikeway Design Guide

The city of Madison, WI utilizes bicycle signal detector loops to improve access and decrease wait times at signalized intersections for bicyclists. Two to four detector loops are installed along any approach where a local neighborhood road frequented by bicyclists meets a signalized intersection at an arterial road. Loops may also be installed on collector roads and bike lanes where they are deemed necessary. Detector loops are typically 6’ by 6’ and square or diamond shaped (as opposed to round). They are often installed during street resurfacings, and are placed between 3” and 9” below the surface. Shallow loops saw-cut into the pavement are most prone to damage. Approximately 80 percent of the city’s 285 signalized intersections have bicycle signal detection loops in place. To help bicyclists identify the signal detectors, the city of Madison is considering using pavement markings or striping to identify the most sensitive parts of the loops.

Design and construction is performed in-house by the City of Madison. Loops cost approximately $500-600 per unit.