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What links the following numbers (and many more) in the UK:

150 -> 1101
1262 -> 1261
241 -> 284 (B)
2035 -> [2,Unclassified] -> [460 (C), 2003 (B)]
398 -> 361 -> 3277 (B)
3001 -> 455 (B)
434 -> [4014 (B), 419] -> [4014 (B), 4008 (B)]
4073 -> 470
568 -> 5419 (B)
5041 -> Unclassified
622 -> [6001 (B), 625] 
622 (temporary) -> 56
6134 -> 61
715 -> 7084 (B)
7002 -> 801
840 -> 874 (B)
8006 -> 806
927 -> [952 (B), 954 (B)]

I can add some American equivalents if people are struggling here

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  • 4
    $\begingroup$ They're all rot13(cbfvgvir vagrtref). $\endgroup$
    – msh210
    Commented Aug 3, 2020 at 15:32
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    $\begingroup$ rot13(ubj qb v qbjaibgr n pbzzrag?) $\endgroup$
    – Bass
    Commented Aug 3, 2020 at 15:34
  • $\begingroup$ Does order matter? $\endgroup$
    – Bewilderer
    Commented Aug 3, 2020 at 16:14
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    $\begingroup$ @simonalexander2005 I think it has many answers. It would be better if you would edit this question a bit so that you may get the intended answer. $\endgroup$
    – Dreopa
    Commented Aug 3, 2020 at 17:12
  • $\begingroup$ Any better? I've tried to add some more information $\endgroup$
    – simonalexander2005
    Commented Aug 4, 2020 at 8:45

2 Answers 2

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As @TruVortex_07 identified for line one, these are all

Road numbers in Great Britain

The first column represents

Original road names

And the second column (after the ->) represents

Current road names

For example

According to Wikipedia, road A1101 was previously known as A150. Going down the list, we see that each road number in the first column is no longer in use. For example, road A1262 is now A1261 (Wikipedia), road A241 is now B284 (Wikipedia), etc.

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  • $\begingroup$ i was just going to edit my post but you beat me to it ;) $\endgroup$
    – TruVortex_07
    Commented Aug 4, 2020 at 13:44
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    $\begingroup$ @TruVortex_07 you had it first. You can edit yours and OP accept your answer! $\endgroup$
    – user69943
    Commented Aug 4, 2020 at 13:46
  • $\begingroup$ naw, your answer is much more complete and expanded on $\endgroup$
    – TruVortex_07
    Commented Aug 4, 2020 at 13:46
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I might have an answer for the first line:

A150 road -> A1101 Road as A150 turned into part of A1101

As for the full explanation, see Daniel C's answer!

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    $\begingroup$ You're on the right lines - but what do I mean by "->"? Why those in particular? The relationship between the two then applies to the rest as well - they're all examples of the same thing. $\endgroup$
    – simonalexander2005
    Commented Aug 4, 2020 at 13:09

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