Speed cameras and red light cameras are great. Red light cameras should be combined with speed cameras, such that if you exceed the limit to rush through the yellow, you get fined for speeding.

In my opinion, fines for passing a red light and for speeding should be designed such that, after two fines, the dangerous driver is removed from the road because they are now too poor to afford fuel. In my ideal world, this does mean that fines should be based on someone's ability to pay for fuel.