What is a ramp that follows the Americans With Disabilities Act guidelines. It is a ramp that is a 1 to 12 ratio meaning that every inch of run, it requires a foot of ramp run. Paired with a 36″ wide ramp run and handrails on both sides, this creates the safest environment to maneuver a wheelchair. Here is an ADA slope for 3 steps onto a porch installed by GreenLight Mobility Charlotte. Call today for your free home assessment and ramp estimate.