[Madhatter]

yes but you see the signs for the traffic lights before you get to the brow, and slow down accordingly. The other way, I'd suggest that those cars have expected it to be clear and it hasn't or they've skidded and gone straight on. That could happen on any road and isn't the design or speed limit thats at fault.
The same things about others making mistakes could be said of any other dual carriageway. I would say though that with it beig sandwiched between two 30's, it is an unusual limit and would perhaps be better to set it at 60. Not that you get much chance to go above 60. suprised there's not a speed camera on the way in as you approach the lights to be honest. And no, thats not me saying there should be one, speed cameras are needed rarely in my opinion.