The causes of left-hook bike accidents are varied and can include:
- Driver error: The most common cause is when drivers fail to see the bicyclist or misjudge the bicyclist's speed. This can happen due to distracted driving or the driver's failure to properly check for oncoming bicycles before turning.
- Poor visibility: Bicyclists can be hard to spot due to their smaller size, especially in low light conditions, at night, or in bad weather. Despite this, drivers still have a duty to pay attention.
- Failure to yield: Drivers may incorrectly assume they have the right of way when making a left turn or may not be aware of laws requiring them to yield to oncoming bicycles.
- Infrastructure issues: Inadequate or missing bike lanes, poorly designed intersections, and lack of signage can contribute to left-hook bike accidents. Situations where bike paths cross roads or driveways without clear markings or signals for drivers can be particularly hazardous.
- Speeding: Speeding drivers often don’t have enough time to react to a bicyclist's presence.
- Lack of communication: When drivers fail to use their turn signals before turning left, it can be difficult for bicyclists to anticipate their moves.
- Impatience or aggressive driving: Drivers who are impatient or exhibit aggressive driving behaviors are more likely to make risky turns without properly checking for bicyclists.