Biker 101: Legalizing “lane splitting” has been an ongoing debate in Texas for quite some time; however California is currently the only state where it is legal. What is “lane splitting”? It is when a two-wheeled vehicle moves between lanes of traffic traveling in the same direction. More narrowly, it refers to passing stopped or slow moving traffic between the lanes at a greater speed than surrounding traffic. It is also sometimes called “white-lining” or “filtering.”