*555: Dial *555 from a mobile phone to report incidents which are urgent but not life-threatening, such as non-injury crashes, erratic driving, traffic congestion, breakdowns, and obstructions on the highway. These calls go to Police communications centres, similar to 111 calls, but are given lower priority.
 

Roadwatch Report: Complete a Roadwatch form to report non-urgent incidents of poor driving, such as dangerous overtaking, crossing the centre line, tailgating or holding up traffic on a motorway. If you can provide a registration plate number, police will write to the driver. Your identity is not disclosed. You can fill in forms online or at your local police station.