I seem to remember that it is illegal to park within 15 yards of a bend, this is to allow lgv's room to get around a corner, it also used to be an offence to park opposite another vehicle (double parking), the volume of traffic, apathy from wardens and the police has allowed the rules to be broken, 2 weeks of towing illegally parked vehicles would have a miraculous effect, but bet your life there would be hundreds of complaints from 'unfairly treated' drivers!
