What must I do to atone for having pursued someone with my car after he nearly hit me, which led to my causing him harm without stopping?

If the car owner could have avoided the collision but did not, then liability falls on him. However, if he could not avoid it due to the inquirer’s transgression, then it appears that the inquirer bears the liability. Since the other person cannot be identified, the inquirer must repent and search for the rightful claimant as much as possible, or give charity on their behalf to compensate for the damage they incurred.