<P> Proponents state that the practice relieves congestion by removing commuters from cars and gets them to use the unused roadway space between the cars, and that lane splitting also improves fuel efficiency and motorcyclists' comfort in extreme weather . In the US, transportation engineers have suggested that motorcycles are too few, and will remain too few, to justify any special accommodation or legislative consideration, such as lane splitting . Unless it becomes likely that a very large number of Americans will switch to motorcycles, they will offer no measurable congestion relief, even with lane splitting . Rather, laws and infrastructure should merely incorporate motorcycles into normal traffic with minimal disruption and risk to riders . </P> <P> Potentially, lane splitting can lead to road rage on the part of drivers, who feel frustrated that the motorcyclists are able to filter through the traffic jam . However, the Hurt Report indicates that, "Deliberate hostile action by a motorist against a motorcycle rider is a rare accident cause ." Lane splitting is not recommended for beginning motorcyclists, and riders who do not practice it in their home area are strongly cautioned that it can be risky if they attempt it when traveling to a jurisdiction where it is allowed . Similarly, for drivers new to places where it is done, it can be startling and scary . </P> <P> Another consideration is that lane splitting in the United States, even where legal, can possibly leave the rider legally responsible .' Safely' is always very much a judgment call . The mere fact that an accident happened while a rider was lane splitting is very strong evidence that on that occasion it wasn't safe to do so...If you've been involved in an accident you will have a hard job convincing an insurance adjuster that the accident was not completely your fault ." </P> <P> When the 2005 bill to legalize lane splitting in Washington State was defeated, a Washington State Patrol spokesman testified in opposition, saying that, "it would be difficult to set and enforce standards for appropriate speeds and conditions for lane splitting ." He also said that officials with the California Highway Patrol told him that they wished they had never begun allowing the practice . Recently, California Highway Patrol removed their guidelines on such practice . </P>

In california it is illegal for motorcycles to split lanes and it is dangerous