Built Environment Accessibility Flashcards

An architect is designing a new ramp to provide access to a building entrance that is 30 inches above the ground. According to the ADA Standards for Accessible Design, what is the minimum required horizontal length for the sloped portion of this ramp?

Answer: 30 feet

The ADA Standards for Accessible Design specify a maximum running slope of 1:12 for ramps. This means for every 1 inch of vertical rise, there must be at least 12 inches of horizontal run. To overcome a 30-inch rise, the ramp must have a horizontal run of at least 30 inches * 12 = 360 inches. Since there are 12 inches in a foot, 360 inches is equal to 30 feet.

A building manager installs a large, wall-mounted digital display in a main hallway. The bottom edge of the display is 48 inches from the floor, and it projects 6 inches from the wall. Why does this installation create a significant accessibility barrier?

Answer: It is a protruding object that is undetectable by a person using a long cane.

According to built environment accessibility standards, objects mounted on walls with their leading edges between 27 and 80 inches above the floor cannot protrude more than 4 inches into the circulation path. This is because a person who is blind or has low vision using a long cane would not be able to detect the object before walking into it, creating a head-level hazard.

What is the primary purpose of a detectable warning surface, characterized by truncated domes, at the edge of a transit platform or at a curb ramp?

Answer: To signal a boundary between a pedestrian path and a vehicular way or drop-off to individuals who are blind or have low vision.

Detectable warnings provide a distinct tactile cue underfoot or via a long cane. Their purpose is to alert people who are blind or have low vision that they are approaching a potentially hazardous area where a pedestrian path ends and a vehicular way begins, or where there is a significant drop-off, such as the edge of a train platform.

Which of the following is a critical design element for an accessible single-user toilet room, as required by standards like the ADA?

Answer: Clear floor space positioned for a parallel or forward approach to the lavatory (sink).

Accessible restrooms must provide adequate clear floor space at all fixtures, including the lavatory, to allow a person using a wheelchair to approach and use them. Standards specify minimum dimensions for either a forward or parallel approach. Doors must not swing into the required clear floor space for fixtures unless specific conditions are met, and dispensers must be within reach range of a person seated on the toilet.

The inclusion of a 'family' or 'companion care' restroom in a large public venue is an excellent example of applying accessibility principles. This feature primarily supports which group that may not be well-served by traditional gender-specific multi-stall restrooms?

Answer: Individuals who require the assistance of a caregiver of a different gender.

A primary reason for providing companion care restrooms is to allow individuals who need assistance from a caregiver to have a private, accessible space. This is especially important when the caregiver and the person receiving care are of different genders (e.g., a father with a young daughter, or a woman with a male personal care assistant).

When designing building signage to be compliant with accessibility standards, what is the purpose of including contracted (Grade 2) Braille in addition to raised tactile characters?

Answer: To provide an efficient means of tactile reading for experienced Braille users.

While raised letters can be read tactilely, Braille is a specific system designed for efficient touch reading. Contracted (Grade 2) Braille uses abbreviations and contractions, allowing experienced Braille readers to read much more quickly and fluently than they could by tracing the outlines of raised print letters. Its inclusion on signage provides an equivalent communication experience for this group.