IRWL Roadway Layout Diagrams
IRWL Roadway Placement Layout Diagrams
As a general rule when determining IRWL roadway placement at crosswalks, place the first IRWLs at the edges of the road to define the shoulders.
Next, place additional IRWLs in the center of the road either directly on the center lane line, or in the center at mid-point, of the turn lane. For each of the remaining traffic lanes, place one signal head in the center of each travel lane.
Be careful to never position IRWLs directly underneath the tires’ wheel path. Vehicle wheels should straddle the IRWLs, NOT directly drive over them inside of a traveling lane.
When positioning the IRWL signal heads, great care must be taken to observe traffic flow patterns. It is essential that each individual signal head is uniquely positioned/rotated towards approaching motorists, at eye level. See Zone of Convergence.
Common 2-Lane and 4-Lane Mid-Block Crosswalk Layouts
4-Lane IRWL Systems Layout Diagrams: