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"This bill would define 'lane splitting' as driving a motorcycle, that has 2 wheels in contact with the ground, between rows of stopped or moving vehicles in the same lane, as specified,"
...

The study found that of the 5,969 motorcycle accidents in California recorded by law enforcement during that period, 997 involved lane-splitting – or 17 percent.

California Governor Signs Bill to Make Lane-Splitting by Motorcyclists Legal | NBC 7 San Diego