Colorado's Lane Filtering Law: Legal Authorization Without Safety Infrastructure
Colorado's lane filtering law went into effect yesterday, August 12, 2026. SB24-079 authorizes two-wheeled motorcycles to overtake another vehicle in the same lane when conditions permit prudent operation. Lane filtering is not lane splitting. Lane splitting is riding between lanes of moving traffic — legal only in California under Vehicle Code § 21658.1. Lane filtering is passing stopped or slow-moving traffic by riding between lanes or between a lane and the curb. Arizona allows limited filtering when traffic is fully stopped and the rider stays under 15 mph. Colorado's new law is broader: it permits filtering when conditions allow safe operation, without explicitly limiting it to stopped traffic. The law does not define "conditions permit prudent operation." That means enforcement will depend on officer judgment, court interpretation, and how the first few citations are adjudicated. A rider filtering at 20 mph past stopped cars at a red light is doing something tha...