What is the standard required landing length for a ramp with a maximum rise of 30 inches?

The correct answer is based on the guidelines established for ramps, particularly in relation to accessibility standards outlined in the Americans with Disabilities Act (ADA). For a ramp with a maximum rise of 30 inches, the ratio of ramp run to rise is essential. The ADA requires a slope of no more than 1:12 for wheelchairs, meaning that for every inch of vertical rise, there should be at least 12 inches of ramp run.

Applying this standard, for a 30-inch rise, the ramp should have a total run length of at least 360 inches (30 inches x 12), which equates to 30 feet. However, the question specifically asks for the standard required landing length at the top of such a ramp. For any rise, a landing that equals the ramp's run is typically recommended to allow for a safe and accessible transition.

In this case, option D specifies "5 feet plus rise length," which implies that an adequate landing length should account for the total run plus additional space for maneuverability at the top. This aligns with best practices for accessibility that ensure safe navigation and adequate space for users to transition off the ramp safely.

The other choices, while providing specific measurements, do not meet the guidelines necessary for a ramp