What Is the Main Cause of Motorcycle Accidents?

Posted on May 7, 2026 written by Jane Paulson in Motorcycle Accidents

Key Takeaways

• Many motorcycle accidents happen because drivers don’t see bikes, especially when turning or changing lanes.
• Motorcycles are easy to miss, especially in traffic or when drivers aren’t paying attention.
• Speeding makes it tougher to react to sudden dangers, raising the risk of a crash.
• Alcohol slows reactions and messes with decision-making, leading to accidents.
• Without protective barriers, motorcycles leave riders vulnerable to serious injuries.

Motorcycle accidents are a serious concern on today’s roads, particularly in Portland, Oregon. What is the main cause of motorcycle accidents? The primary factor is driver negligence, with motorists often failing to detect motorcycles in traffic. This is particularly common in left-turn accidents or lane-change collisions, where the other driver simply doesn’t see the motorcycle. Other contributing factors include excessive speed, alcohol impairment, and improper turning, which are frequently compounded by rider inexperience or poor visibility. According to the Portland.gov – PBOT Releases 2024 Deadly Crash Report, these are among the most common causes, underscoring the importance of both riders and drivers being aware and cautious on the road.

At Paulson Coletti, we understand the dangers motorcyclists face and are committed to helping victims seek justice. If you’ve been in an accident, a Portland motorcycle accident lawyer can guide you through the legal process.

Contact Our Portland Motorcycle Accident Lawyer

Contact us today Call Us (503) 226-6361

The Leading Cause of Motorcycle Accidents: Driver Negligence

Driver negligence is the top cause of motorcycle accidents, often because drivers fail to notice or yield to motorcycles. Their smaller size and limited visibility, especially in traffic or when changing lanes, make motorcycles harder to see, increasing the risk of serious collisions.

Left-turn and lane-change accidents are especially dangerous, as drivers frequently fail to yield. These crashes are more hazardous for motorcyclists, who lack the protection that cars provide. As noted in the Portland.gov PBOT 2024 Crash Report, these are some of the most common causes of accidents.

Other Common Causes of Motorcycle Crashes Riders Should Know

While driver negligence is the leading cause, other factors contribute significantly to these crashes. Understanding these causes can help reduce the risk of an accident.

Excessive Speed

Riding at high speeds, especially in heavy traffic or bad weather, increases the risk of a crash. Speeding reduces the time a rider has to react to potential hazards, making it harder to avoid collisions.

Alcohol Impairment

Riding under the influence of alcohol or drugs impairs a rider’s ability to react quickly and make sound decisions, leading to fatal accidents.

Improper Turning

Improper turns, whether by the motorcyclist or other road users, can lead to dangerous situations, such as turning too sharply or failing to signal intentions clearly.

Why Motorcycles Are Harder for Drivers to Notice

Motorcycles are often overlooked by drivers because of their smaller size and lack of the same protections as cars. Even when motorcyclists are right in front of them, their smaller frame can cause them to be missed, especially at intersections or when drivers are distracted.

This lack of visibility increases the likelihood of accidents, leaving motorcyclists more exposed, especially when drivers don’t check their blind spots or misjudge the speed and distance of a motorcycle.

How Fault Is Determined in a Motorcycle Accident Case

Determining fault in motorcycle accidents is crucial for securing compensation. Negligence, often due to drivers failing to yield or make safe lane changes, typically determines fault.

Motorcyclists should document the incident, gather witness statements, take photos, and seek medical attention. Proper documentation and legal support ensure you receive the compensation you deserve.

Related reading: What Are the Oregon Motorcycle Laws Every Rider Should Know?.

What to Do After a Motorcycle Accident in Portland

If you’ve been in a motorcycle accident in Portland, it’s crucial to act quickly. Here’s what you should do:

• See a Doctor: Even if you don’t feel injured right away, it’s important to get a medical evaluation to identify any hidden injuries.
• Take Photos: Document the scene, vehicle damage, and any visible injuries.
• File a Police Report: Ensure the accident is officially recorded by reporting it to the authorities.
• Consult a Lawyer: Contact a Portland motorcycle accident lawyer to discuss your legal options.

Taking these steps can help safeguard your rights and strengthen your case for compensation.

Talk With a Portland Motorcycle Accident Lawyer About Your Case

After a motorcycle accident, the legal process can feel overwhelming. A Portland motorcycle accident lawyer can help you get the compensation you deserve. At Paulson Coletti, we provide personalized support for motorcyclists injured due to negligence.

If you or a loved one has been involved in an accident, contact us for a free consultation. Call 503-226-6361 today to see how we can help.