You could still shaft him without involving the police.
I worked for a bus company. If a legitimate complaint was received about a driver's conduct, the driver was automatically suspended without pay while it was investigated.

A 'legitimate' complaint had the sender's name and address so it could be verified. The driver wasn't told any names.

You only need the place and time of the incident to report him. He'll get in trouble and it'll stay on his record: he'll either be more careful in future or get the sack.

Bus companies take their drivers' conduct seriously, believe it or not, and if you report him it won't be brushed under the carpet.

You won't find out what happened to him but it's still worth doing. I bloody would.
(Juan Quar is clinging to her front teeth on, Wed 10 Mar 2010, 7:18, Reply)