Right hook and left cross collisions

Two crash types account for a large share of serious cyclist injuries, and both come from the same source: a driver turning across a space they did not check, occupied by someone whose speed they misjudged. This is general information, not legal advice.

The right hook

A driver passes a cyclist and then turns right across them, or turns right into a driveway or side street while the cyclist is alongside. The rider has no escape route: the turning vehicle sweeps through the space they occupy, and the kerb is on the other side.

What makes it a driver's failure rather than bad luck:

• The overtake itself created the conflict. A driver who passes a cyclist and immediately turns across them has chosen to overtake into a manoeuvre they were about to make.
• A cyclist proceeding straight in a lane has the right to continue. A cyclist has the rights and duties of a driver, and a vehicle crossing their line of travel must yield to it.
• The blind spot is the driver's problem to solve. Checking a mirror is not the same as checking the space beside the vehicle.
• Signalling is not a right of way. It announces an intention. The duty to make the movement safely is unaffected.

Where a bike lane runs to the right of a turning lane, the geometry is worse still, because the road design routes riders up the inside of vehicles that are about to turn across them. That is covered at bike-lane collisions.

Sources: Veh. Code, § 21200 (a cyclist has the rights and is subject to the duties applicable to the driver of a vehicle); CACI No. 700 (a driver must keep a lookout for pedestrians, obstacles, and other vehicles and must control the speed and movement of the vehicle), Judicial Council of California Civil Jury Instructions (2026 edition).

The left cross

An oncoming driver turns left across a cyclist travelling straight. The duty is the familiar one: a driver intending to turn left must yield to all vehicles approaching from the opposite direction close enough to constitute a hazard, and must keep yielding until the turn can be made with reasonable safety. A bicycle is a vehicle approaching from the opposite direction.

The recurring defence is that the cyclist "came out of nowhere" or was going faster than expected. Both describe a perception failure. A narrow profile is harder to see and its closing speed is harder to judge — which is a reason drivers get this wrong, not a reason the duty shifts.

Electric bicycles sharpen it. A rider maintaining a speed a driver associates with a much slower machine is precisely the situation in which a distance-and-speed judgment fails. That is a fact about the driver's assumption rather than about the rider's conduct — provided the e-bike was operating within its class limits, on which see e-bikes.

Sources: Veh. Code, § 21801 (left turn — duty to yield, and the oncoming driver's duty once the turn has lawfully begun).

The same collision on a motorcycle, where the perception problem is the whole case: motorcycle left-turn collisions.

What proves either one

• Point of impact on the vehicle. Damage to the right front quarter says something different from damage to the passenger door.
• Where the bicycle and rider came to rest, relative to the turn.
• Turn geometry — how far into the turn the vehicle was when contact occurred.
• Sight lines from the driver's position, photographed from seat height rather than standing.
• Camera footage. Increasingly the rider's own; also buses, businesses, and doorbell cameras. Days, not weeks.
• Event data from the vehicle, showing speed and braking.
• The bicycle itself, unrepaired — the damage locates the strike.

How fault is decided.

Common questions

What is a right hook?

A driver overtakes a cyclist and then turns right across the cyclist’s path — or turns right at a driveway or intersection into a rider who is alongside. The cyclist has nowhere to go, because the turning vehicle closes the space they were occupying.

What is a left cross?

An oncoming driver turns left across the path of a cyclist travelling straight. It is the same geometry as the classic motorcycle left-turn crash, and it turns on the same duty: yield to oncoming traffic close enough to constitute a hazard.

The driver says they signalled. Does that settle it?

No. Signalling communicates an intention; it does not create a right of way. A driver turning across a lane must still ensure the movement can be made safely, which means checking the space they are about to cross rather than announcing that they intend to cross it.

They say they did not think I was going that fast.

Common, and it is a description of the driver’s error rather than a defence. Drivers systematically underestimate bicycle speed, particularly e-bikes. Misjudging the speed of a vehicle you were required to yield to is a failure to yield.