Rewrite the sentence to eliminate ambiguous, remote, or broad reference. If a car accident happens and you leave the scene before the police arrive, it is a crime.

The correct answer should be "It is a crime to leave a car accident scene before the police arrives".

Here the ambiguous part is related to what is considered to be a crime. The "it" can refer to both there being a car accident and leaving the scene, so it's ambiguous as to what the crime is. This way it is known what the crime is and the sentence makes more sense and doesn't sound off.