Research shows left turns at intersections are dangerous and slow traffic. Benjamin Rondel/The Image Bank via Getty Images Vikash Gayah: When you make a left turn, you have to cross oncoming traffic.

More than 60% of traffic collisions at intersections involve left turns. Some U.S. cities – including San Francisco, Salt Lake City and Birmingham, Alabama – are restricting left turns. Vikash Gayah, ...

Q: I was taught when turning left at an intersection onto a street with two lanes in each direction, to turn into the left (and closest) of the two lanes. If I want to eventually be in the right-hand ...

More than 60% of traffic collisions at intersections involve left turns. Some U.S. cities—including San Francisco, Salt Lake City and Birmingham, Alabama—are restricting left turns. Subscribe to our ...