DURHAM (WTVD) -- NCDOT and North Carolina State researchers are studying the effectiveness of the "zipper merge." The rather unique sign was installed 2 weeks ago where NC 147 meets southbound I-85.

CHICO — Highway 99’s seven-mile double barrel through Chico is a topic of heated claims between licensed drivers about how to properly drive. Though drivers education may have taught about merging ...

COLORADO, USA — Zipper merging needs better signage so badly that the Federal Highway Administration commissioned a study to determine if specific signage would get more drivers to zipper merge and ...