lei do mais fraco

[...] Such scheme would place the presumption of blame against whoever was driving the most powerful vehicle involved in an accident, so they or their insurers would be liable for costs or damages.
If a cyclist were hit by a car, the presumption of blame would fall on the driver, while a cyclist would automatically be blamed if he or she knocked down a pedestrian. [...]

[...] Similar policies — which would not extend to criminal law — have already been adopted by Germany and Holland, where transport campaigners say they have had a significant influence in changing attitudes towards cycling. [...]

Fonte: The Sunday Times

no reino unido estuda-se um plano em que o maior transporte seja responsável pelo acidente, se não provar que fez o possível para o evitar. já existem leis similares noutros países, que tal?