The most common defence is that the motorist did not realise s/he had been involved in an accident. Typically a motorist might be accused of clipping someone’s wing mirror or causing a scratch in a car park and driving off without stopping. If the motorist genuinely had no idea that s/he had been involved in an accident this is a valid defence. However, if the evidence shows that, for example, there was a loud bang, or for some other reasons the motorist should have been aware, then the motorist may have difficulty persuading a court that s/he did not know of the accident. Claiming that the other party was at fault for the incident is not a defence in law.