Ahhhhhhhhh yes, I remember finding that a while ago.
And I replaced the offending sign with the correct one.
But of course, I was using another copy of Abel.wrp (Malden)
I have this copy that I use to play about with things on.......a sort of test-bed island.
I corrected that sign and have done lots of stuff to this island. The airport even has a full set of runway lights on this copy, plus all the towns and villages have streetlights........less bright streetlights, ones that don't light up the whole island. Anyway.....I digress .....
Unfortunately THobson, the only way you can permanently fix this is to load it into a wrp editing program and replace it from there.
Planck