Thanks. I could not find the individual maps that refers to, but I did find an older set that was differently numbered.avtur wrote: ↑Fri Oct 16, 2020 12:47The attached map shows in some detail the exact location of the expanded ULEZ, the numbered sections within the main map can all be opened up to show the position of the boundary within each section. I've opened a number of the subpages and it appears that there may be 'escape' routes at all the zone entry points.
http://lruc.content.tfl.gov.uk/ulez-bou ... detail.pdf
Assuming no changes between them, apart from slip roads and places where you need to make a left turn off the North Circular to cross under or over it being excluded to allow neccessary movements, I could only see two exceptions where the zone did not follow the strict lines of the A406 or A205. Albeit in some places the line did seem to include a tiny section of some side streets. Presumably because of where camera infrastructure could be placed.
The first exception was the A4 between Chiswick and Hogarth Roundabouts. Presumably this is because you cannot leave the M4 at the Chiswick Roundabout, where I suppose it is entirely arbitrary whether you start the zone a little outside the Circulars at M4 junction 2, or a little inside where people can circulate back on the roundabout. Maybe there is a problem with people not realizing they need to leave the motorway early and use the A4 to access them, so have to circulate back?
The other, though, is interesting. It stood out as section 16 on your map, but it is not inescapable. That is on either side you can stay within or without the zone, and it crosses the A406 on a bridge anyway. Although u-turns are not prohibited, possibly they wanted to be safe and provide lorries an opportunity to be able to safely turn back. Though that is not an opportunity afforded at any other junction. Otherwise the only explanation I can see it they want to keep the Sainsbury's and retail park outside the zone, so that people will not have to pay to do their big shopping by car.
It is the A1199 and B168 as far as the roundabout that is excluded from the ULEZ:
https://goo.gl/maps/2HSNiASprDfYRb586