ADA - Separate characters for the blind and sighted.

One sign with seperate Visual & Tactile text provides more design flexibility.

ADA Requirement:  "703 Signs703.1 General. Signs shall comply with 703. Where both visual and tactile characters are required, either one sign with both visual and tactile characters, or two separate signs, one with visual, and one with tactile characters, shall be provided."

Raised text and braille is more obvious  in different light conditions.