A coroner is a judge who investigates, among other things, violent or unnatural deaths and a road death is just that. The purpose of an inquest is to determine how the person has been killed, not to find guilt or apportion blame. There will usually be a number of individuals who give evidence at an inquest, including the pathologist, police officers, witnesses, and drivers involved.
Family members of the victim are able to attend and can have legal representation with them to help with asking any questions they may have. The process can be uncomfortable and impersonal and lead to more questions than answers. Quite often, the police are going through evidence the family may not have been aware of, with the level of detail police can go into. It can be quite an upsetting day, but it can help to understand what has happened. The uncomfortable details are necessary for the coroner to help them come to a conclusive finding.