Unofficial diagram of a STOP Ahead sign in Mexico, Source.
This file was derived from:

 Low Clearance Ahead sign (Mexico).svg: 
Alto stop sign.svg:
Low_Clearance_Ahead_sign_(Mexico).svg: *Canada_-_stop_ahead.svg: *MUTCD_W3-1.svg:
derivative work: Fry1989
Trucks_Keep_Right_sign_(Mexico).svg: *File:RU road sign 3.32.svg: User:Юкатан
derivative work: Beao
UK_traffic_sign_811.svg: UK Government
derivative work: Fry1989
derivative work: Fry1989
Alto_stop_sign.svg: *Stop_sign_light_red.svg: User:MagicImage
derivative work: Fry1989