Cycling Road sign glitch

The Cycling Road sign glitch is a glitch in Generation I where the player is unable to read a sign north of the Cycling Road.

Procedure

1. The player should stand here, facing up, and holding the B button as not to go down.

   

   The sign affected by the glitch.

2. Even when pressing A, the player won't read the sign.

YouTube demonstration

https://www.youtube.com/watch?v=gDL8AB6zE9U

Explanation

When in this position, the player is standing in Route 17. The sign is in Route 16, and so it has "sign interaction" defined - but when the player is in Route 17.

tl;dr : the game doesn't make a sign interactive across routes.