In the U.S., the left lane is the passing lane or the “fast” lane. Drivers typically use the left lane to pass other vehicles. In California, lanes are numbered from left to right, with the number 1 lane being the leftmost lane. Drivers of standard passenger vehicles are advised to stay in the far-right lane for slow driving and use the left lane for passing.

Considering their relatively slow speeds, you may be wondering if semi-trucks can use the left lane. Discover what the law says about large trucks driving in the left lane in California and learn about the potential risks and dangers.

What the Law Says