Is Lane Splitting Legal in Colorado?

K.C. Harpring

personal injury Attorney

Motorcyclists often wonder: Is lane splitting legal in Colorado? As of recent legislative changes, Colorado has legalized lane filtering under specific conditions, but full lane splitting remains prohibited. Acknowledging these laws helps motorcyclists avoid fines, makes safer road interactions, and educates other drivers about sharing the road responsibly with motorcycles in Colorado. At Dormer Harpring, our motorcycle accident attorneys team advocates for victims and offers legal guidance for those involved in car and motorcycle crashes.

Colorado Lane Filtering vs. Lane Splitting

Lane splitting is not legal in Colorado, but lane filtering, under specific conditions, is now allowed for motorcyclists. This change reflects evolving state policy to improve rider safety in slow-moving urban traffic. The Colorado General Assembly passed SB24-079, which officially took effect on August 7, 2024.

Lane Filtering (Legal)

Lane filtering allows motorcyclists to pass between lanes of stopped traffic, but only when:

• The road’s speed limit is 45 mph or less.
• All adjacent traffic is completely stopped.
• The motorcycle travels no faster than 15 mph.
• The rider is at least 18 and has a valid motorcycle endorsement.

As the Colorado State Patrol outlines, the law is designed to reduce low-speed collisions by allowing safe maneuvering in gridlock conditions.

Lane Splitting (Illegal)

Lane splitting and riding between moving vehicle lanes are illegal in Colorado. Unlike filtering, which only applies to stopped traffic, splitting involves weaving through active lanes, which increases collision risk.

C.R.S. § 42-4-1503 requires motorcycles to remain within a single lane and prohibits overtaking vehicles within that lane. Attempting to split lanes can result in fines or fault in a crash.

Key Differences

Understanding the difference between the two is essential:

• Filtering: Legal when traffic is fully stopped.
• Splitting: Illegal when vehicles are in motion.

Additional contrasts:

• Speed: Filtering limited to 15 mph.
• Legal status: Filtering is allowed under SB24-079; splitting is not.
• Safety: Filtering occurs during standstills; splitting increases unpredictability.

The Colorado State Patrol is actively educating motorists and riders on these updates.

Lane Filtering in Colorado

Lane filtering is now legal in Colorado

Lane filtering is now permitted under Colorado law, effective August 7, 2024. Under SB24-079, motorcyclists operating properly endorsed bikes may legally ride between lanes of stopped traffic, but only when particular conditions are met to promote safety and predictability on the road.

To comply with the statute, riders must follow these rules:

• Stop filtering when traffic starts moving.
• Only filter where adequate space allows.
• Ride with due care and not exceed 15 mph.

According to the Colorado State Patrol, enforcement will target unsafe or unauthorized maneuvers, particularly when riders exceed the speed limit or attempt to filter in moving traffic.

Conditions under which lane filtering is permitted:

• The road must have two or more lanes in the same direction.
• Lane filtering is only allowed when traffic is completely stopped.
• Motorcycles must not travel faster than 15 mph while filtering.
• Motorcyclists must yield to pedestrians and other road users.
• It is prohibited to filter on highways or roads exceeding 45 mph.

Knowing these guidelines guarantees that motorcyclists can safely and legally take advantage of lane filtering.

When did these laws take effect?

The lane filtering law became effective in Colorado in 2024 following approval from the state legislature. The law outlines specific circumstances under which riders may filter through traffic, focusing on ensuring safety while granting motorcyclists more flexibility in urban congestion.

What is the Purpose of the Lane Filtering Law?

The legislation seeks to simplify traffic flow and handle main safety issues. Especially in crowded cities, letting motorbikes negotiate between stopped cars greatly lowers the likelihood of getting struck from behind.

The New Law Could Save Lives

Rear-end collisions are a frequent cause of motorcycle fatalities. When motorcyclists can position themselves ahead of stopped traffic, they are less vulnerable to inattentive drivers who may fail to notice them at intersections or in slow-moving conditions. In states where similar laws have been enacted, studies indicate a decrease in motorcycle-related accidents.

Other potential benefits of lane filtering include:

• Reduced road congestion: Motorcycles moving through stopped traffic help clear space, leading to a smoother traffic flow.
• Decreased exposure to exhaust fumes: By moving ahead of vehicles, riders avoid prolonged exposure to harmful emissions.
• Lower crash risks for motorcyclists: Studies from other states show that controlled lane filtering can reduce crash rates when properly executed.

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With Rights Comes Responsibility

While the new law provides motorcyclists with additional riding privileges, it also demands responsible behavior on the road. Riders must exercise caution and adhere to the stipulations outlined in the legislation.

Where do Motorcycle riders stop in a long queue?

When traffic is backed up, motorcyclists may stop at the front of the queue at an intersection if they are lawfully filtering through lanes. Positioning at the front also prevents motorcycles from being trapped between larger vehicles, reducing the risk of collisions in stop-and-go traffic situations. However, they must yield to pedestrians and ensure their movements do not pose a risk to other drivers.

In many cases, motorcycles that successfully filter to the front will position themselves between the frontmost stopped vehicles, ensuring that they are visible to all drivers when the light turns green. This positioning allows them to start moving safely before larger vehicles begin accelerating, reducing the risk of being rear-ended.

Additional considerations include:

• Ensuring visibility to surrounding traffic: Riders should avoid stopping in blind spots where they might not be seen by larger vehicles.
• Staying within designated lane spaces: Motorcyclists should not extend beyond lanes or encroach upon crosswalks.
• Being prepared for a quick start: When filtering to the front, motorcyclists should be attentive to traffic signals to avoid delaying other vehicles behind them.
• Avoiding unnecessary filtering: If traffic is flowing at an acceptable speed, filtering may not always be necessary.

Why can’t you pass on the right?

Motorcyclists should not pass on the right unless a designated lane exists for such movement. This prevents accidents caused by sudden lane changes or vehicles unexpectedly turning right.

Understanding Lane Filtering

Motorcyclists: Filter Safely

Lane filtering is only permitted when vehicles are completely stopped, and motorcyclists must proceed with caution, ensuring they do not exceed a reasonable speed differential with other traffic. Safety tips for motorcyclists include:

• Always remain aware of surrounding traffic.
• Avoid sudden movements or aggressive filtering.
• Wear high-visibility gear to increase visibility.
• Check for turning vehicles before filtering forward.

Share the Road: What Other Vehicle Drivers Need to Know

Car and truck drivers should remain aware of motorcycles filtering through traffic. Checking mirrors and blind spots before changing lanes is crucial to avoiding collisions. Additionally, blocking a motorcyclist from filtering could be considered reckless driving.

How drivers can help improve safety:

• Stay alert for motorcycles in stopped or slow-moving traffic.
• Avoid sudden lane changes without checking mirrors and blind spots.
• Allow motorcycles to filter ahead without obstructing their path.
• Be mindful at intersections where filtering is most common.

Is lane filtering allowed on one-lane roads?

No, lane filtering is restricted to multi-lane roads where traffic is completely stopped. Filtering on a single-lane road poses a high risk of collision.

What about on roads with center left-turn shared lanes?

Lane filtering is not permitted in center turn lanes. These lanes are designed for vehicles preparing to turn and should remain unobstructed.

Contact our Motorcycle Accident Attorneys Team

Dormer Harpring has extensive experience handling motorcycle accident cases, helping injured riders secure compensation, and managing complex legal claims successfully. If you’ve been involved in a motorcycle or car accident due to lane filtering or lane splitting misunderstandings, our experienced motorcycle accident lawyers team at Dormer Harpring is here to help. Contact us today for a free consultation and let us advocate for your rights.

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Available 24/7 – Call us now at (303) 747-4404 for expert legal help. Your case matters, and we’re here to fight for you!

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