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Yes Paul, I'm afraid you have missed the point. It's common sense to not enter unless your exit is clear.It's not the rules but the practical application.And why these are not generally used in smaller areas without room for manoeuvre.What is not clear is how you can ascertain if your exit is clear when turning left or right when obstructions or pedestrian lights block the view or exit.Example is the concrete pillar of the M4 and a pedestrian crossing at Windmill road as well as a centre obelisk which prevents a view and the fact that you have to look left and now both ways for two way cycling. It means that you have to proceed with caution but also very likely to find yourself unable to exit without stopping even if simply going ahead.Coming out of the former car park exit in West Ealing and turning right is always difficult because of an obscured view of traffic from the right, often ending up with a stranded vehicle in the westbound side.Keep Clear on both sides would allow a better chance for that to happen less.Cannot see how the Yellow Grid makes that any different appear from the delays of hesitation. The obscured view will remain.Most large box junctions are deliberately clear of obscured views. Hence no real excuse to enter and block. Again it's more often than not two close running buses or long trailered HGVs stopping sooner than expected or misjudging the flow.The junction at the clock tower is more pragmatic as the exit does get blocked but that is more often than not caused by sudden stoppages in Boston Road which prevents right tuning vehicles and again is often blind sighted by vehicles turing left into the same road and suddenly stopping.  It's usually HGV and Buses that block the road here.

Raymond Havelock ● 408d

Mark Evans is quite right. All that is needed is ' KEEP CLEAR' and white lines.That keeps the junction clear for exiting traffic and more importantly a clear line of view for emerging traffic into the opposite  direction. Simple clear and effective.Cannot see the point of a Yellow Box junction at this point as there will be hesitation from the great many road users who when turning right or left who are not sure whether they can enter it if their exit is not clear and more to the point that they cannot see if the way is clear.  Similarly, do you move into it if  it is not a completely clear road ahead?  Or indeed is it purely for through traffic?  This is very apparent at the Windmill Road junction in Brentford. The lack of signage does not help but the hesitation causes congestion and near misses.And if going by one suggestion that this does not apply to Cyclists ( and no doubt, because they cannot be prosecuted will ignore it. The whole thing is nullified as a benefit.It seems like a pointless waste of money when a much cheaper, effective and clearer alternative should be used firstI can only assume that this is purely to make money from errors of unclarity from a loophole which permits cameras and thus make money. So few contest these, even though they have a high chance of winning, but it's so time consuming and tricky it's win win for the authorities. Further undermining trust in a fair society.Such a simple device exists which can have an advisory for Cyclists to proceed with caution.

Raymond Havelock ● 409d