For similar reasons even here in sleepy Devon I've taken to driving with a dash cam permanently on. I personally try and be as courteous and considerate to othe drivers as I can so that frustration on their part does not get the better of them. Unfortunately our roads especially around denser populations are very busy compared with 20 or more years ago and many more have to use cars to get to around for work. Unfortunately the pressure and stress of modern life spills over into using cars. The person who's late for a meeting, bad day at work, shouted at by boss, problems at home, there are loads more, add to this being in a vehicle when you don't want to be or need To be doing something else and for some it can escalate out of control into anger and aggressiveness. Mix this with poor driving by some other road users and can result in dangerous situations with people behaving irrationally. Because this I find that nowadays the only safe approach to driving on the highway is defensively, being completely aware of what is happening several cars ahead and behind and being prepared to take evasive action. If I get tailgaters I just let them pass, and I try and keep back from cars in front, and I am always waiting for another road user to do something I don't expect.
