Name a council that give a damn for anybody. They're either run by idiots as the OP suggests, or they just don't care (until they get sued for something).
In my local area, the roads being as poor as they are elsewhere, they waited for months to reopen the road down Cheddar Gorge as opposed to putting it right there and then. As soon as the weather was good, they shut the road properly to resurface it, thus depriving the local shops some more much needed income. In the same vein, in Portishead last year or possibly the year before, some bright spark decided to shut the High Street...you've guessed it, at Christmas! They changed their minds in the end but it's just that someone thought it could work in the first place. Local businesses were of course delighted, and the list goes on...
The M4 and M5 in the area have both had roadworks and a 50mph limit for the best part of 4-5 years, and the only things you see are a variety of different coloured traffic cones. The Avonmouth Bridge was resurfaced one year some 6-7 years back and they used the wrong asphalt and had to do it again! Now, I'm sure these (ir)responsibilities belong to the Highways Agency but they're all borne of the same stupidity. Perhaps the speed cameras raise too much revenue to make the work any faster?
I drove through France last year - a journey in total of over 2000 miles and saw two lots of roadworks. Road surfaces over the mountain passes of the Tourmalet and the Aubisque, among others were nigh on perfect (and slightly more prone to adverse weather than Cheddar gorge). One of the roadworks we saw was a temporary, rolling roadwork which took up around 1 minute of our journey and less than 30 moving yards as it pressed along. I don't need to tell you just how poor the roads are and just how utterly inept those who do it, are. They'll blame everything from the weather to lack of resources, but the reality is, the HA and most local authorities idea of road maintenance is crap and they need to put their hands up, admit to being the muppets they are and go somewhere where they can be taught properly.