Ok, Police should be suppling an event number when the crash is reported. Why because this is one of the first things the insurance company wants. As for exchanging details also good to do as your insurance company needs them so do the police. Excahnging details IS NOT an admission of fault. DO not admit fault as you can stuff up your own insurance.
I know in our area due to a push from the councils and LTNZ for better accident info all crashes reported to police are documented and a number asigned. All good good for getting roads resealed etc.
Where it gets a bit grey for LTNZ and the Police is the injury scale. For the courts an injury is more than triffling. i.e broken bones cuts needing sutures, for the LTNZ scale an injury is a small cut to just seeing a Doc for a bruise. So even if you have an injury in might not be enough for an injury charge, but once Police know about the crash they should take the details.
Hope this helps
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