It's rather strange: we're constrained by various laws every day, some convenient and some not - and yet most of these go unquestioned and unchallenged, except the speed limits, something in place to preserve life during an extremely risky practice - driving - which is routinely undertaken by civilians with little or no formal training. Sure it'd suck if I got a ticket for going 6 mph over the limit (10 kph, the minimum threshold for triggering a speed camera here), but them's the breaks and that's the law. Road safety is managed by people who know way more about it than me, so I'll go with what they say.