Comment on Princess Diana Conspiracy by gg.

if the braking system computer was tampered with.
Electronic activation by wireless remote control.
Energise ABS ‘hold’ solenoid valves to stop all of the cars brakes working; the brake pedal would be very hard and dead.
Fire the pump motor and left side solenoids to make the car veer sharp left, the steering wheel would not be able to override the brake torque steer. And the car would most certainly crash.