Lane Splitting

Lane splitting (also called lane filtering, lane sharing, or white-lining) is the practice of riding a motorcycle between lanes of slow-moving or stopped traffic, typically on multi-lane roads or highways. It allows motorcyclists to progress through congestion rather than sitting in traffic, and research suggests it can reduce rear-end collisions by removing motorcycles from between stopped cars.

Legality varies widely. California was the first US state to explicitly legalize lane splitting (in 2016), and several other states have since followed with lane filtering laws (Utah, Montana, Arizona, and others). In most US states, lane splitting remains illegal or unaddressed by law. In much of Europe and Asia, it is legal and commonly practiced.

If lane splitting is legal in your area, practice it safely: keep your speed differential low (no more than 10-15 mph faster than surrounding traffic), avoid splitting at high speeds, watch for cars changing lanes, be visible, and don't split between large vehicles. If lane splitting is illegal where you ride, don't do it — the ticket isn't worth the few minutes saved, and drivers don't expect motorcycles between lanes.

One critical aspect often overlooked in lane-splitting discussions is insurance and liability. In California where it's legal, insurance typically covers lane-splitting accidents using the same fault determination as any crash. However, in states where it's illegal, lane-splitting often automatically assigns fault to the motorcyclist regardless of circumstances. Beyond legality, many riders don't realize that lane-splitting techniques vary by traffic speed. Filtering through stopped traffic at 5-10 mph is completely different from splitting moving 45 mph traffic at 55 mph. Most experienced splitters have a personal rule: never split when traffic exceeds 30-40 mph.