More modern design of major roundabouts will include a left bend immediately before entry to the roundabout. Erecting fences or growing bushes on the approach road is another technique to slow traffic, making the driver get closer to the give way line before being able to see traffic on the roundabout.
Pedestrian crossings are usually situated near to junctions as traffic is generally going slower there. Crossings in the middle of long, straight, fast roads was a good method of killing pedestrians.
Scotsrich wrote: Mon Jan 13, 2025 8:41 am
The 3 I meant (which means nothing to 99.9 % on here) are the Cement works junction, the Innerwick turn off and the entrance to Torness all of which involves turning on or off a 70mph road with shit visibility.
I haven't looked at the junctions you mention but any improvements to Trunk road junctions like those cost a fortune in capital expenditure and may well be the Highways Agency's responsibility. County Councils can't just start modifying junctions as they see fit, the traffic management costs alone (diverting traffic around the works) would bankrupt them.
The work I was doing was based simply on "why are drivers failing to cope with their environment at this particular point / junction but not at similar locations". The basic principle was to make some cheap engineering changes - if you change what people see, you'll probably change what they do. Putting a cycle lane along the sides of the carriageway makes it appear to drivers that the road they are on is narrower and they then drive slower. A half second increase in the intergreen time of traffic light sequences, bar markings/rumble strips, new signs etc.
The North Circular around that there Larnden went through a series of traffic calming evolutions over the years, islands/pedestrian refuges every one or two hundred metres, next up, a white line running from the opposing side carriageway to the left of the next island making it appear the road was narrowing and then full hatching between the islands. All cheap attempts to reduce overall speed.