If your are in an accident and receive a traffic summons, you need to consult with an attorney as soon as possible. If you ignore the summons and are convicted, that conviction can be used against you in a civil action.
For example, if you are given a speeding summons and fail to appear, that conviction (albeit a conviction on default or non-appearance) can be use as evidence to show that you were negligent at a trial regarding personal injuries.
The implications are vast – in fact, if you are seriously injured and are found to be 100% at fault, you will not be permitted to be compensated at a personal injury trial.
Call your lawyer!