"Conor" wrote in message
Although I agree that road design of itself does make a road 'bad' it can make it more or less dangerous-difficult to use.
I can think of one particularly bad design, which is the A3 out of Portsmouth. At one point a dual carriageway comes up to a roundabout with traffic light control. A third lane is formed on the right just before the lights. Beyond the roundabout most traffic moves right by one lane to join the M275 at the start of a flyover. Some people nip around on the third lane at the roundabout and are already in L3, which causes some problems. However, half way to the flyover another road joins from the left and the drivers try to push their way into L2 to go over the flyover, rather than join L1 and use the roundabout below the flyover which has a sliproad up to the motorway beyond the flyover. They are using a short cut out of the Royal Dockyard.
I think a better solution would be to move the traffic before the first roundabout into the correct lanes, making the third lane on the left not the right, and for traffic not using the motorway. The traffic joining half way to the flyover should be forced to use the roundabout under the flyover.
The answer dreamt up by the camera safety people is to put a speed camera just before the flyover, about 200 yards before the road becomes a motorway. So that everyone maintains the 40 mph limit. The result is that not only are cars changing lane and joining all over the place, but they are also braking for a speed camera.
Jams in L3 just an observationHi, As a regular user of busy motorways, I often see a situation where L3 comes to a standstill due to the sheer volume of vehicles in that one, yet L1 + L2...
Ian
