I think it all depends on what sort of traffic calming measures they decide to put in.
Chicanes, OK - but speed humps, not if they go on for miles. Jo might know one classic example of a mile-long speed bump road in the Cannock area, the one running between Heath Hayes and Hednesford, which I used to use when visiting Hednesford FC. It was a total PIA and didn't do anything for my suspension (or temper) …..
OK, Heath Hayes village centre was at one end, and a primary school at the other, but it always seemed interminable!
I don't have a problem with 20 mph limits, or any sensible speed limit for that matter, but I do have a problem with councils that (a) impose speed limits that have unnecessary long run-offs, like 1/2 a mile into the countryside each side of the village they're protecting and (b) constantly change the speed limits along a road, like one near Hinckley where there's 7 changes of speed limit - 30,40,30,50,30, 40 so on - within 2 miles. Make speed limits fair and sensible, and the vast, vast majority of people will obey them.
I know a lot of urban councils, Birmingham being one, have introduced huge swathes of 20mph "suburbs". They must be pretty much impossible to police, drivers know they're very unlikely to be caught, so inevitably a few will speed. And it has been shown that 20mph limits actually increase the number of fatal accidents: Bath and North East Somerset
https://www.telegraph.co.uk/news/2017/1 ... il-admits/