Sort of on-topic maybe, I have long been of the belief that technology drives in a way, the manner in which traffic laws are enforced. The advent of radar being accepted as reliable helped make speed enforcement a favorite because the officers had an accepted technology to back up their professional judgement. They thus avoid any pretext of he-said-she-said if the summons is disputed. This of course assumes the officer has the requisite training documented, and the testing of the apparatus is current and documented.
It strikes me now, that the widespread use of in-car cameras gives the officers that technological device to back up their judgement regarding: following too closely, agressive driving, illegal lane change, texting or phone use, etc.