Blinded by a bike's taillight?
Maybe the driver shouldn't tailgate a cyclist...
The flashing taillight of a cyclist is the equivalent of a car driver stepping on the brakes at high frequency.
If drivers wake up when they see the brake light goes on, then they should also wake up if they see the flashing taillight of a bike. Once they wake up, they will leave a safe following distance.
Also, a flashing light drains the batteries slower than a steady light.