In road transport, a is a portion of a roadway designated for use by a single line of vehicles to minimize traffic conflicts and guide drivers. Most public highways feature at least two lanes, separated by painted markings or embedded markers to control flow in each direction. Lane Safety and Width Trends
Narrower lanes allow for "complete street" features like wider sidewalks and protected bike lanes , which further calm traffic. Lane Types and Terminology traffic lane
Lanes are typically classified by their function or position: In road transport, a is a portion of
Crashes are reportedly 1.5 times higher on streets with 12-foot lanes compared to those with 9-foot lanes in 30–35 mph zones. Lane Types and Terminology Lanes are typically classified
Recent urban research suggests that standard lane widths, often set at 12 feet (3.6 meters) in the U.S., may be less safe than narrower alternatives.
Studies from institutions like Johns Hopkins University found that reducing lane width to 9 or 10 feet in cities can lower crash risks and discourage speeding without increasing congestion.