Lane-splitting, as the practice of riding a motorcycle between lanes of stopped or slow-moving vehicles is called, is technically legal in just one U.S. state. That means there is no speed limit for lane-splitting, as you can’t do it legally at any speed! But in California, where it is legal, are there actual rules about how you do it?

The short answer is to keep your speed differential below 10 mph and keep your overall speed under 30 mph. But those aren’t the law – instead, they’re recommendations based on studies of lane-splitting behaviors.

Here’s the long answer – there is no speed limit just for lane-splitting. In California, lane-splitting is now formally a recognized and legal activity. Here’s the actual provision of the California Vehicle Code (CVC):

21658.1. (a) For the purposes of this section, “lane splitting” means driving a motorcycle, as defined in Section 400, that has two wheels in contact with the ground, between rows of stopped or moving vehicles in the same lane, including on both divided and undivided streets, roads, or highways.

Think you can lane-split faster than this guy? You’ll be unpleasantly surprised…

Note there is no mention of how to do it, just that it’s “a thing.” The California legislature leaves safety up to the individual motorcyclist and also empowers the California Highway Patrol and other organizations to “develop educational guidelines relating to lane splitting in a manner that would ensure the safety of the motorcyclist and the drivers and passengers of the surrounding vehicles.”

Why does the law explicitly allow the CHP and others to give out lane-splitting advice? In the long, contentious road leading to the adoption of section 21658.1, the CHP posted guidelines about lane-splitting safety. Soon, a helpful citizen – concerned about governmental overreach – filed suit against the CHP to take them down, as there was no public review process before they were posted. As of this writing, there are no official guidelines from the CHP, but the 10-mph differential and 30-mph overall speed seems to be universally accepted.

So will you get a ticket if you exceed these 10/30 guidelines? Maybe! In California, and other states, there’s a “basic speed law” that states you can only ride as fast as conditions allow, leaving a lot of discretion to individual patrol officers. Talk to riders, and you’ll find that if you keep the speeds under 30 or 40 mph and don’t attract too much attention, you’ll likely never be pulled over for lane-splitting. Ride too fast, change lanes too much, or just behave like a jackass in general and you’ll risk attracting Johnny Law’s attention. Ride safe!