Perception Error
Misjudging speed, distance, or the intention of another road user. The number one cause of crashes.
What is it
A perception error is when you or another road user misjudges the situation: speed, distance, intent, or simply fails to notice a hazard. The human brain is easily fooled — especially regarding motorcycle speed and visibility.
How it happens
A driver sees the motorcycle but misjudges its speed — and pulls out at an intersection. A rider doesn't notice a light change. A rider thinks they can make the corner at this speed — and runs wide. All perception errors.
How to reduce the risk
- Always assume you are NOT seen — even when someone appears to look at you
- Read other drivers' intentions: are the car's wheels turned? Is the driver on a phone?
- Judge your speed by the speedometer, not by feel
- Leave margins — in both time and distance
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Related terms
Visibility Blocker
An object blocking your line of sight — a truck, fence, bush. Anything could be behind the blocker.
Target Fixation
Involuntarily staring at an obstacle instead of the safe path — and riding straight into it.
Blind Spot
An area around a vehicle where the driver cannot see you — not in mirrors, not in peripheral vision.
Left Turn Danger
A car turns left across your path — the most common type of motorcycle collision.
Car Door Opening
A driver or passenger opens a parked car door directly into a motorcyclist's path.
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Highside
A violent ejection over the top of the motorcycle — one of the most dangerous motorcycle crashes.