Talk:A404(M) motorway

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It is wrongly numbered as it is south of the A4 and it is an A road with motorway regulations.

Why does being south of the A4 prevent it being the A404(M)? Please either explain in the article or link to somewhere that does. Loganberry (Talk) 14:16, 10 August 2005 (UTC)

It's very debatable if it's wrongly numbered or not. The Great Britain road numbering scheme says that to be a zone-4 A-road (i.e. in the "cone" defined by the area between A4 and A5 roads), no part of it should enroach on an anticlockwise cone (the 3-zone, defined by the cone between the A3 and A4 roads). Here's a better explanation.
The A404 does not encroach into the 3-zone, whereas the A404(M) does. Whether that constitutes breaking the numbering rules is unclear - sufficiently so that the claim should probably be removed. (M404 would be a correctly numbered motorway, as it's in the motorway 4-zone which differes from the A-road 4-zone). --Erath 14:33, August 10, 2005 (UTC)