Montana Lane Filtering Law

On March 3, 2021, Montana governor Greg Gianforte officially signed SB9, titled "An act providing for motorcycle lane filtering," into state law. According to the law, riders of two-wheeled motorcycles in Montana may now lane filter on roads with lanes wide enough to pass safely, not to exceed speeds of 20 mph when overtaking slowed or stopped vehicles. The lane filtering law took effect on October 1, 2021. Lane filtering remains legal within the state of Montana in 2023.

By Montana's definition, lane filtering consists of the act of overtaking and passing other vehicles that are either stopped or traveling at 10 mph or under in the same direction of travel, and in the same lane of traffic.

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