Final answer:
The space between a handrail at a ramp and the wall should be at least 15 inches to provide enough room for individuals to grip the handrail comfortably.
Step-by-step explanation:
The space between a handrail at a ramp and the wall should be at least 15 inches.
According to the procedure provided, the mark for 3 meters from the bottom of the ramp indicates that the space between the handrail and the wall should be 15 inches.
This spacing ensures enough room for individuals to comfortably grip the handrail while ascending or descending the ramp.