The above may be true but one advantage may be that the idiots who drive at far above 30mph in towns & cities will - hopefully - be stopped from doing so.
I think I could live with this as a compromise. When you have a village sandwiched between 2xnational speed limits or a 20mph school bit. I'd be ok if they added something to the speed limit sign it could recognise that enforced a limit.
would be nice to force some minimum speed as well, nothing more frustrating when u stuck behind miss daisy doing 30 mph on a 60 mph B road.
very dangerous coz u have to overtake
There's a couple of national speed limit roads near me. I sometimes get up really really early on a Sunday morning so I can actually do the speed limit. I've concluded that even if I get up at 4am, on a bright sunny warm day, on a 60mph straight road with a mile+ of visibility. I'd have to get past someone doing 26mph.
And I should also point out, I take into consideration that not every driver / car can maintain 60mph round a bend, up a hill, etc. But the number of drivers I see who even on a straight and can seriously see 1-1.5 miles of clear road, are still not capable of getting anywhere near the speed limit.