The U.S. Federal Highway Administration has released a TechBrief that examines a treatment to reduce approach speeds at unsignalized intersections on two-lane rural roads by narrowing lanes using rumble strips in the median and on the right-lane edge.

Click on the link below for a downloadable PDF of the TechBrief:

Crash Impact of Smooth Lane Narrowing with Rumble Strips at Two-Lane Rural Stop-Controlled Intersections