Recently had a family member that got hit by a car. While reading up on the legal process, I found this, so hopefully it's of help.
Hit-And-Run Claims - ICBC Claim Guide - Mussio Goodman
1) If possible, follow the other vehicle to try to get the license plate information;
2) Notify the police at the accident scene and definitely within hours of the accident;
3) Notify ICBC within hours of the accident, if possible;
4) Place a sign at the accident scene looking for witnesses and the other driver; 5) Place an advertisement in the local newspaper looking for witnesses and the other driver;
6) Follow-up with the police regarding the investigation; and
7) If the accident occurred nearby to some buildings, knock on some doors to see if there are any witnesses.
In other words, you are really asked to play detective so that ICBC cannot turn around later and argue that had you taken certain steps you may have been able to identify the driver and vehicle involved in the accident.