The general publishing policy guidance for the Department for Transport staff producing printed material for people with visual disorders highlight the need to avoid light typefaces, use of 14 pt type and maximising contrast of colours as much as possible.
Specific guidance related to red/green colour blindness include using where possible;
dark colours on light background;
increased contrast between colours and type;
use of stripes, hatching etc in place of colours;
avoidance of red/green adjacent to each other.