21st September 2015 at 10:15 am #3229
Thanks for the information. Very useful. We seem to be increasingly under pressure to cater for driver behaviour!18th September 2015 at 7:07 am #3228dhulsonParticipant
Sorry David, I’ve not been paying attention! In answer to your question, there is not sufficient room to separate the two lanes by an island. They do however have a staggered stop line to help reinforce the idea that they are treated seperately.28th August 2015 at 12:14 pm #3226ianwallisParticipant
We have a similar problem junction here in Derby. The problem has reduced but not disappeared following a change to make the left lane a left filter arrow rather than a full phase. It’s not helped by drivers who move forwards on the left arrow then change lanes as they enter the junction – we can’t design for stupidity.17th August 2015 at 1:55 pm #3224
Many thanks for this comment. In the first instance you mentioned, were the lanes segregated by an island?13th August 2015 at 1:51 pm #3223dhulsonParticipant
At locations where we have adjacent lanes controlled by phases that can start at different times, we try to stagger the stop lines to indicate that the lanes are treated seperately. This also conveys to pedestrians that the two lanes may move independantly of each other and allows improved visibilty for pedestrians when the two lanes are being seperately controlled.
We have one location at a T junction where the left and right turn lanes could start together if a pedestrian phase was not called, but if the pedestrian phase was required the left turn lane would be held and start significantly later. It was noticed that drivers were not always obeying their signals and the left turning drivers were being triggered by the right turners getting a green (although their respective signals were easily visible). This was treated by introducing a phase delay when the pedestrian was not called to ensure that the left turn always started some time after the right turn. Whilst this might be seen as wasting time, it has pretty much cured the problem and pedestrians no longer have left turning vehicles conflicting with them.13th August 2015 at 12:17 pm #1034
Hi. We have a fairly typical arrangement at a junction in one of our boroughs, but there seems to be a high number of collisions. We have a two lane approach – the left lane is left only and the right lane is ahead and right. Both lanes are separately fully phased, with the left turn being able to run in the preceding stage to the right lane.
It appears that vehicles in the right lane are starting off prematurely, and we can only think that it is because they see the vehicles in the left lane move off and jump to the conclusion that they can proceed too, even though they still have a red.
We have close-coupled secondaries, so it’s only with difficulty that the vehicles in the right lane can see the heads for the left lane.
Does anyone have anything they can offer on this?
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