California would be the first state to approve the traffic-evading tactic, already widespread on traffic-choked Los Angeles freeways.

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LOS ANGELES — Motorcycle lane-splitting — the rush-hour time saver for bikers that enrages many drivers — may be poised for legalization.

California would be the first state to approve the traffic-evading tactic, already widespread on traffic-choked freeways of Los Angeles. The state Assembly approved the legislation Thursday, and supporters believe it will clear the Senate as well.

The measure would allow motorcycles to travel between cars at speeds up to 15 mph faster than the flow of traffic, up to a speed of 50 mph.

The bill’s backers cite studies showing the practice is safer than trapping bikers behind cars, which leaves them vulnerable to more serious rear-end collisions. But their proposal has riled detractors and supporters alike.

“Lane-splitting is inherently dangerous,” said Thomas Freeman, a passionate opponent of the practice who said his opposition movement, hosted online at, has more than 1,000 members.

While some motorcyclists applauded the action, the American Motorcyclist Association called for even less restrictive rules.

“We don’t like this bill,” said Nicolas Haris, the association’s Western states representative. “It goes a long way in the right direction, but it falls short.”

Lane-splitting — a common practice in European nations but generally outlawed in the U.S. — has been a fuzzy topic in California. The state has never expressly forbidden or allowed it.

Technically neither legal nor illegal, the practice has had the tacit approval of the California Highway Patrol and the Department of Motor Vehicles.

Motorcycle-industry veteran Bruce Steever — who commutes on the 405 freeway and invariably lane-splits during rush hour — applauded the proposed legislation, restrictions and all.

“Those numbers make me happy,” he said of the speed limits. “There needs to be a codified law.”

The motorcycle association’s Haris, despite his organization’s complaints with the bill’s specific language and speed limits, said he hoped a new California law would inspire legislators in other states to adopt similar laws.

Legislative bodies in Washington, Oregon, Texas, Nevada and Tennessee have already considered, proposed or voted on lane-splitting laws. To date, none of the proposed legislation has passed.

The California bill, which has broad support, is being spearheaded by Democratic Assemblyman Bill Quirk. He co-authored the measure with Republican Tom Lackey, a former California Highway Patrol (CHP) officer, and Democrat Kansen Chu, who became interested in the topic after an employee’s nephew was killed while lane-splitting at high speed.

The speed limits were determined with the help of the CHP and a safety study by University of California, Berkeley, professor Tom Rice.

That study, scheduled for public release soon, investigated 6,000 California motorcycle accidents — 1,000 involving lane-splitting — and concluded that legalizing the practice was safer than outlawing it, Quirk said.

“The study found that lane-splitting was safer, compared to being stopped in the traffic,” Quirk said. “Oftentimes motorcyclists would get rear-ended. Motorists just don’t see them.”

The bill passed the Assembly on a 58-14 vote. It now faces a review and vote in the state Senate before heading to the governor’s desk for final approval.

Until recently, the highway patrol and the DMV published guidelines for safe lane-splitting. But they removed the guidelines from their publications last year after opponents complained that the agencies appeared to endorse a practice that critics argued was not legal.

“The ambiguity gave riders the idea that they had a free ticket,” Lackey said. “These parameters will alert all motorists to the safe practice of lane-splitting.”

It has also been a hot-button topic. Motorcyclists view it as a special California legal loophole. But some drivers view it as a dangerous or unfair way to get ahead in traffic.

“Motorcyclists know it’s not safe. They just want to get from point A to point B faster than the cars,” Freeman contended. “We have drivers who are talking on their cellphones, who are texting, who are daydreaming. And this other distraction makes it a virtual circus.”

Former Los Angeles City Council member Dennis Zine had 33 years’ experience in the Los Angeles Police Department, 18 of them as a motorcycle officer. He said he splits lanes, at safe speeds, but thinks the principal issue with the proposed measure is ticketing a motorcyclist who is breaking it.

“Unless the pursuing officer is on a motorcycle, the officer in a patrol car cannot possibly apprehend the vehicle that is splitting lanes,” Zine said. “The bottom line is there is no law if there’s no law enforcement.”