If we're going to post a list of rules, we might as well post the official rules straight from the California Highway Patrol:
Motorcyclists who are competent enough riders to lane split, should follow these general guidelines if choosing to lane split:
- Travel at a speed that is no more than 10 MPH faster than other traffic – danger increases at higher speed differentials.
- It is not advisable to lane split when traffic flow is at 30 mph or faster – danger increases as overall speed increases.
- Typically, it is more desirable to split between the #1 and #2 lanes than between other lanes.
- Consider the total environment in which you are splitting, including the width of the lanes, size of surrounding vehicles, as well as roadway, weather, and lighting conditions.
- Be alert and anticipate possible movements by other road users.
__Scott R. Nelson, 2008 KTM 990 Adventure, 2001 Honda XR650L, Folsom, CA