I'll repeat this here because it adds what I think it valuable context for the circumstances.
Current national policing practice is generally that if there isn't a clear and ongoing threat to public safety or an ongoing investigation and a person voluntarily presents or makes themselves available for interview by the police, an arrest is unlikely to be made because there is no need determined.
Whatever the circumstances of the incident and whoever was at fault, which is probably still being determined by the investigating officers, I doubt very much that the driver is either continuing to drive or posing a flight risk and may very well be fully cooperating with police enquiries. Not arresting the driver in these situations is a complete red herring in these situations because it is in no way indicative of any failing by the police in the process of their investigations. I'm pretty certain journalists chuck it in to articles either to pad a word count or because they think it implies something. It doesn't.
I'll repeat this here because it adds what I think it valuable context for the circumstances.
Current national policing practice is generally that if there isn't a clear and ongoing threat to public safety or an ongoing investigation and a person voluntarily presents or makes themselves available for interview by the police, an arrest is unlikely to be made because there is no need determined.
Whatever the circumstances of the incident and whoever was at fault, which is probably still being determined by the investigating officers, I doubt very much that the driver is either continuing to drive or posing a flight risk and may very well be fully cooperating with police enquiries. Not arresting the driver in these situations is a complete red herring in these situations because it is in no way indicative of any failing by the police in the process of their investigations. I'm pretty certain journalists chuck it in to articles either to pad a word count or because they think it implies something. It doesn't.