What is the minimum clear knee space required for all front approach accessible counters?

The minimum clear knee space required for front approach accessible counters is crucial for ensuring that individuals with mobility impairments can comfortably use them. The correct answer specifies a clear knee space of 30 inches wide by 17 inches deep. This dimension is established to accommodate the average person's leg and knee requirements while seated, promoting both accessibility and comfort.

The width of 30 inches is intended to provide sufficient space for a wheelchair user to approach the counter easily. Meanwhile, the depth of 17 inches allows for adequate room for knees, while still permitting access to items on the counter without requiring extreme leaning forward.

These dimensions adhere to guidelines set by accessibility standards such as the Americans with Disabilities Act (ADA), which aim to ensure that spaces are usable by all individuals, regardless of their physical capabilities.