Normally players who have been on the server for a while and have got some form of reputation will stop and apologise for any traffic collision if they caused it. If you are talking about people driving dangerously then its down to PD to challenge that mentality, hopefully speed cameras will reduce dangerous driving. I have been pulled over a fair bit on my criminal character for dangerous driving, failing to maintain lane and speeding in various areas on the map so there is definitely some police officers attempting to combat this issue.
You mentioned that admins are not punishing players for breaking road laws in NCZs but the rules state that victimless crimes can be committed in NCZs and often breaking road laws has no victim. I would understand if two players had a traffic collision and one of them was killed during the incident then it is a different matter as there is clearly a victim and a player could have charges pressed for manslaughter, but from my experience this is quite rare.