What would be your view of a motorist who did something perfectly legal but which you considered dangerous?
What, like passing me with half a metre of room? My view would be that laws are boundaries. Cyclists are exempt from some laws but do have to take responsibility for their own actions. Some laws are very tight and thats why some people break them, others allow leniency.
E.g. Speed limits for a car are 30mph +10% +1mph. Thats why speed cameras are set to 34mph. So even though the speed limit is listed at 30mph, you can actually do 34mph and the camera wont flash and the police wont come after you.
In a 70mph limit on a motorway. You can go up to 78mph. Police will only pull you over if you are doing over 80 in most circumstances because it has been said that they cannot enforce the 70 limit because most people do 80.
More 20 limits are trying to be introduced, but they have been badly criticised by politicians and the police because they are unenforcable due to the amount of people who would ignore them.
A new method of tracking the speeds of vehicles is to have cameras at the start and end of a road, timing how long it takes for the car to go along it. You can then work out the average speed of the car and if it has sped up along the road. This method of tracking I can imagine is likely to be put in place at some point. It does seem like a feasible solution to vehicles speeding.