What type of lavatory could NOT be used as a handicap accessible lavatory?

A pedestal lavatory is not suitable as a handicap accessible option primarily due to its design. This type of lavatory typically has a base that does not allow for space underneath, which restricts access for individuals using wheelchairs or other mobility devices. Accessibility standards require that there be adequate clearance beneath the sink to accommodate these users, allowing them to approach comfortably.

In contrast, wall-mounted lavatories are often designed specifically for accessibility, providing ample space underneath for wheelchair users. Undermount lavatories are also not installed with a bulky base, allowing for easier access. Vanity lavatories might offer some accessibility features, especially if designed with consideration for space requirements, but the standard pedestal model limits access significantly due to its structure.