Colorado Motorcycle Laws

Colorado Motorcycle Laws Every Rider Should Know

If you ride in Colorado, knowing the law matters. It can help you avoid tickets, ride more confidently, and protect yourself after a crash. Colorado motorcycle laws are not always intuitive, especially when riders hear terms like lane filtering, lane splitting, or the dead red law used interchangeably.

At Rider Justice, we believe riders deserve straight answers. Colorado riders trust Rider Justice because we do more than handle motorcycle injury cases. We support rider education, sponsor safety training, and advocate for laws that protect riders on Colorado roads. Scott O’Sullivan has also been publicly involved in legislative efforts affecting rider safety and road accountability in Colorado.

This guide breaks down four motorcycle laws every Colorado rider should understand:

• Dead red light law
• Lane filtering vs. lane splitting
• HOV and Express Lane rules
• Colorado helmet laws

Why Colorado motorcycle laws matter after a crash

Motorcycle law is not just about avoiding citations. It can affect fault arguments, insurance disputes, and how a driver’s conduct is judged after a collision. When a rider follows Colorado law and a driver still causes a crash, that matters. When an insurance company tries to blame a rider based on confusion about lane filtering, helmet use, or traffic positioning, the details matter even more.

That is one reason Rider Justice spends so much time educating the riding community.

1. Colorado Dead Red Light Law for Motorcycles

Colorado has a motorcycle-friendly rule often called the dead red law. It applies when a traffic signal does not detect your motorcycle.

Under Colorado law, a motorcycle rider may proceed through a signal if the traffic control signal is malfunctioning, inoperative, or does not recognize the presence of the motorcycle. In that situation, the rider may treat the intersection like a stop-controlled entry and proceed only when it is safe to do so.

What riders should know

A motorcycle cannot just blow through a red light because it is inconvenient. This law is meant for situations where the signal fails to change because it does not detect the bike or remains stuck on red or yellow through repeated cycles.

Practical rider guidance

If you believe the light is not recognizing your motorcycle:

1. Come to a full stop.
2. Wait through a reasonable signal cycle.
3. Make sure cross traffic is clear.
4. Proceed cautiously only when it is safe.

Why this matters

Many riders have experienced intersections where the sensor never picks them up, especially late at night or on lighter bikes. Colorado law recognizes that problem. Still, the key word is caution. If a crash happens while crossing against a red signal, the facts will matter.

Source: https://leg.colorado.gov/bills/sb19-144

2. Colorado Lane Filtering Law

Lane filtering is now allowed in Colorado in limited circumstances. This is one of the most talked-about changes in Colorado motorcycle law, and it is also one of the most misunderstood.

Colorado law allows a two-wheeled motorcycle to overtake or pass stopped vehicles in the same lane only when specific conditions are met. The overtaken vehicle must be stopped, vehicles in adjacent lanes moving in the same direction must also be stopped, the road must be wide enough to pass safely, the motorcycle must be traveling 15 mph or less, and conditions must permit prudent operation. The rider must stop filtering once the surrounding vehicles begin moving. This provision is scheduled to repeal on September 1, 2027, unless extended.

When lane filtering is legal in Colorado

Lane filtering is allowed only when all of the following are true:

• You are on a two-wheeled motorcycle
• The vehicle you are passing is stopped
• Adjacent same-direction traffic is also stopped
• The lane is wide enough to pass safely
• You are traveling 15 mph or less
• Conditions allow safe and prudent operation

Colorado’s driver handbook also reflects this 15 mph rule.

What is still illegal

Colorado’s lane filtering law is narrow. It does not legalize everything riders may hear described online.

A rider still may not:

• Ride on the shoulder to get past traffic
• Pass to the right of a vehicle in the farthest right-hand lane on a non-limited-access highway
• Ride into oncoming traffic to pass
• Continue filtering once surrounding traffic starts moving
• Treat lane filtering like free-form lane splitting at speed

Lane filtering vs. lane splitting: what’s the difference?

Lane filtering means moving slowly past stopped traffic under narrow legal conditions.

Lane splitting usually means riding between lanes of moving or slow-moving traffic outside those narrow stopped-traffic conditions.

That distinction matters. Colorado specifically created a limited exception for lane filtering, but it did not legalize broad lane splitting. The state’s prior rule prohibited operating a motorcycle between lanes of traffic or rows of vehicles, and the new law only carves out a narrow exception for stopped traffic under strict conditions.

If traffic is moving and you are slicing or weaving between cars, that is not what this law authorizes.

Source: https://leg.colorado.gov/bills/SB24-079

3. Can Motorcycles Use HOV Lanes in Colorado?

Yes. In Colorado, motorcycles may use many HOV and Express Lanes, and on many CDOT Express Lane corridors motorcycles ride free.

Colorado’s legislative overview says Express Lanes may be used for free with a motorcycle, while CDOT’s current Express Lane guidance states that motorcycles may travel for free on all Express Lane corridors except the I-70 Mountain Express Lanes. CDOT specifically says motorcycles may travel for free on the I-25 corridor, C-470, US 36, and Central 70, but motorcycles using the I-70 Mountain Express Lanes must pay the posted toll.

What riders should know

For most metro-area CDOT Express Lanes, motorcycles can use the lanes for free and do not need an ExpressToll pass just to get that free use. But the I-70 Mountain Express Lanes are different. There, motorcycles can use the lane, but they must pay the toll.

A lot of riders hear “motorcycles can use HOV lanes” and assume that means every lane is free everywhere. That is not quite right. In Colorado, many Express Lanes allow free motorcycle use, but the I-70 Mountain Express Lanes are a key exception.

Because tolling rules can vary by corridor, riders should always check current CDOT and ExpressToll guidance before assuming a lane is free. See the CDOT Fact Sheet.

4. Colorado Helmet Law for Motorcycles

Colorado does not require every adult rider to wear a helmet. But riders and passengers under 18 must wear a protective helmet while riding. Colorado also requires eye protection for motorcycle operation unless the rider is wearing a helmet with eye protection.

Basic helmet rule in Colorado

• Under 18: helmet required
• 18 and older: helmet not required by Colorado law
• All riders: eye protection is required unless your helmet provides it

Important note for injury claims

Even though adult riders are not legally required to wear a helmet in Colorado, insurance companies may still try to use helmet non-use as part of their argument after a crash. That does not automatically decide liability. The driver who caused the crash is still responsible for the crash. But injury arguments can get more complicated, especially in head injury cases. That is exactly where experienced motorcycle-specific legal help matters.

Colorado law gives adult riders a choice, but smart riders should still think seriously about full protective gear every time they ride.

Colorado riders should also remember that state law requires a valid motorcycle endorsement, registration, and insurance. Colorado law also limits motorcycle operation to no more than two abreast in a single lane. These rules may seem basic, but they can become important after a traffic stop or crash.

What should you do if a driver says you were riding illegally?

After a motorcycle crash, drivers and insurance companies often make fast assumptions about what the rider did wrong. They may claim a rider was lane splitting when the rider was legally lane filtering. They may misunderstand the dead red law. Or they may try to use helmet non-use to distract from the driver’s fault.

That is why riders need legal advice from a team that actually understands Colorado motorcycle laws and how they apply in real-world crashes.

Why riders trust Rider Justice

Rider Justice is not just another personal injury brand trying to market to motorcyclists. Rider Justice was built to advocate for riders, educate riders, and stand up for riders when the stakes are high. From safety classes and insurance education to real involvement in rider-protective legislation, Rider Justice works to protect Colorado riders on and off the road.

Frequently Asked Questions About Colorado Motorcycle Laws