Researcher: Tony Voigt and Alicia Nelson

Sponsor: Texas Department of Transportation

In order to assess driver assumptions about lane assignments on frontage roads approaching interchanges and complex intersections, CTS researchers conducted a literature review, a practitioner survey, focus groups, a driver computer-based survey, and finally a field test. The studies focused on determining what drivers believe will happen to each of the lanes at frontage and arterial road intersections, and what roadway geometry might violate their expectations. The studies also evaluated drivers’ understanding of current and new concept signs and markings for lane assignment applications. Based on the data from these studies and a field test of several new concept signs, a set of guidelines was developed to assist TxDOT in selecting the best signing and marking practices for these types of intersections.

For more information contact Alicia Nelson.