Once upon a time it was an offence to obstruct the road, yet that is what "traffic calming" does.
As for design restictions on humps, I can negotiate one hump that I go past virtually every day, supposedly checked after installation as correct, and yet the front of my car will ground out on the road, even if I'm doing less only 10mph
One busy road near us has a system of chicanes. Great. Now all the boy racers see it as a challenge as to how fast you can negotiate them. The average speed in that road is probably still 35mph despite the efforts of the traffic planners.
Near me a small shopping parade had its own service road in front of it, set back from the main road. It offered parking for about 5 cars, meanwhile when the shops had deliveries, the vans double parked in the service road, without obstructing the main road. The council thought this was a bit off, so they got rid of the service road, and created a 3 space layby instead from the main road. 2 parking spaces lost, so the shops have less custom. Meanwhile delivery vans now still double park, but in the main road, so bunging up the high street, and creating hazards as drivers try to get past, yet can't see properly because of a bend.
It's simple these things are a menace. In fact all traffic calming is. All it does is restrict traffic flows and creates bottlenecks so that the average driver then goes faster, often too fast, the moment they see a hint of not so open road. How much money has been wasted on these schemes that don't work?
