One interior TTY must be provided at locations defined as public accommodations with ________ or more pay telephones.

One pay telephone is below the ADA threshold; the requirement to provide an interior TTY is not triggered until four or more pay telephones are present at the location.

Two pay telephones still falls below the ADA threshold of four; no interior TTY is mandated at this quantity.

The ADA Standards for Accessible Design, Section 217.4.2, require that at least one public TTY complying with Section 704.4 be provided when four or more public pay telephones are located in an interior space at a public accommodation. This threshold ensures that people who are deaf or hard of hearing have access to text telephone communication at locations where multiple pay phones exist. The four-telephone trigger is the specific numeric threshold codified in the ADA standard for interior TTY provision.

Six is above the correct ADA threshold; requiring an interior TTY only at six or more telephones would leave many qualifying locations without mandated TTY access.

Eight is substantially above the correct ADA threshold of four and would incorrectly exempt a large number of public accommodation locations from the TTY requirement.