First thing Wizz, relax. You're not in any trouble, providing you weren't drunk or flouting the rules of the road (Driving the wrong way down a one way street etc- I have prosecuted someone for that before.) You obviously weren't speeding, and as long as you were in your own car, you should be fine. Contact you insurers and relay the details of the incident and they will handle the bureaucracy. Your premium will rise if you make a claim but any costs of this incident will be covered by it. Accidents happen everyday. If the woman makes a civil claim against you, it may cost you extra...but hitting a (Large) bus at a slow speed...she's probably trying it on!