Motorcycle Lane Splitting Laws by State 2026: Where It's Legal

Motorcycle lane splitting — riding between lanes of slow-moving or stopped traffic — remains one of the most controversial and misunderstood traffic laws in the US. As of 2026, only California explicitly permits lane splitting for motorcycles. Several other states permit the related practice of "lane filtering." This guide clarifies the laws for both motorcyclists and car drivers who need to know when to expect motorcycles between lanes.

Key Takeaways

• California is the ONLY US state that explicitly permits motorcycle lane splitting as of 2026
• Utah, Montana, Arizona, and Hawaii permit "lane filtering" (splitting only at stops or slow speeds)
• Lane splitting is illegal in 44+ states
• Car drivers must be aware of motorcycle lane-splitting laws to avoid door-opening collisions
• The California Highway Patrol issues guidelines recommending max 10 mph speed differential for safe lane splitting

Lane Splitting vs. Lane Filtering vs. Lane Sharing

Lane splitting: Riding between lanes of moving or slow-moving traffic at speed — permitted only in California.

Lane filtering: Moving between lanes of stopped or very slow traffic (typically under 10 mph) — permitted in Utah (2019), Montana (2021), Arizona (2022), Hawaii (pending), and a few others.

Lane sharing: Two motorcycles riding side-by-side in the same lane — legal in most states (a motorcycle lane is wide enough for two motorcycles).

States Where Lane Splitting or Filtering Is Legal

California — Full Lane Splitting Permitted: California AB 51 (2016) explicitly legalized lane splitting. The California Highway Patrol provides safety guidelines:

• No more than 10 mph faster than surrounding traffic
• Not recommended above 30 mph
• Do not split near large vehicles (trucks, buses, RVs)

"California's lane splitting legalization is supported by UC Berkeley research showing that lane-splitting motorcyclists are 30% less likely to be rear-ended in stop-and-go traffic than motorcyclists who don't split lanes." — California Highway Patrol Guidelines, 2024

Utah — Lane Filtering (Limited): HB 149 (2019) allows motorcycles to filter between stopped vehicles at speeds up to 15 mph, on roads with speed limits of 45 mph or higher.

Montana — Lane Filtering (Limited): SB 9 (2021) allows filtering at speeds up to 20 mph when traffic is stopped.

Arizona — Lane Filtering (Limited): SB 1273 (2022) allows filtering between stopped vehicles on roads with speed limits of 45 mph or higher.

States Where Lane Splitting Is Illegal

All other states (approximately 44+ states) prohibit both lane splitting and lane filtering. In these states, motorcycles must occupy a full lane like any other vehicle.

Penalties in illegal states:

• Traffic citation ($50-$300 typically)
• Points on motorcycle license
• Higher liability in crash scenarios

What Car Drivers Need to Know

In California and filtering states, car drivers should:

• Check mirrors before changing lanes — motorcycles may be approaching between lanes
• Avoid sudden lane changes in stop-and-go traffic
• Never intentionally block lane-splitting motorcyclists (illegal in California)
• Leave adequate space in adjacent lane when merging

Practice motorcycle laws and other traffic rules on Wheelingo for your permit test.

Frequently Asked Questions

Is lane splitting legal in any US state? Only California explicitly permits lane splitting for motorcycles. Utah, Montana, and Arizona permit limited "lane filtering" at low speeds near stopped traffic.

What is the difference between lane splitting and lane filtering? Lane splitting involves riding between moving lanes of traffic at speed. Lane filtering is moving between stopped or very slow traffic (typically under 10-20 mph). California allows lane splitting; Utah, Montana, and Arizona allow lane filtering only.

Can a car driver be cited for blocking a lane-splitting motorcycle in California? Yes. California law prohibits intentionally blocking or impeding a lane-splitting motorcycle. Drivers who deliberately move to prevent a motorcyclist from passing can be cited.

Is lane splitting safer than not splitting? UC Berkeley research found lane-splitting motorcyclists are less likely to be rear-ended than those who don't split. The California Highway Patrol recommends splitting only at safe speed differentials (under 10 mph faster than traffic).

What states are considering lane splitting legalization? As of 2026, multiple states (including Texas, Oregon, and others) have had lane splitting bills introduced but not passed. Check your state legislature for current status.

What is the fine for illegal lane splitting? In states where lane splitting is illegal, fines typically range from $50-$300 for a first offense. Some states treat it more seriously if involved in a collision.