I think it uses Google maps, and maps is very easy to change the road names. I think it was even changed by someone on this boardOn another thread about the Albion/palace rivalry someone was aggrieved (quite rightly!) about it being labelled the M23 or A23 derby. Being curious I decided to go on the AA Route Finder site for best travel plan from Selhurst to Brighton. This is it :
View attachment 137331