If you only had one camera for recording road traffic incidents (as opposed to 'action cam' footage), what would be the best mounting position?

I'm leaning more towards a rear-facing camera as most of the bad driving occurs behind, when cars pass by far too close to me. A helmet-mounted camera would be my second choice and a forward-facing camera mounted on the handlebar would be my third choice.

However, I'm interested in other people's opinions.