An analysis conducted by researchers from UC Berkeley’s Safe Transportation Research and Education Center (SafeTREC) found that lane-splitting is relatively safe if done in traffic moving at 50 mph or less, and if motorcyclists do not exceed the speed of other vehicles by more than 15 mph.
“Surprisingly, we found that the difference in speed between the motorcycle and the surrounding traffic was a bigger predictor of injury than speed alone,” said study lead author Thomas Rice, epidemiologist at SafeTREC, which is based at the UC Berkeley School of Public Health. “Above a 15-mile-per-hour speed differential, the risk of injury rose significantly.”