For the purpose of these regulations the following terms and phrases are defined:

(a) Terminal facilities. As used in these regulations the term “terminal facilities” means all facilities, including waiting room, rest room, eating, drinking, and ticket sales facilities which a motor carrier makes available to passengers of a motor vehicle operated in interstate or foreign commerce as a regular part of their transportation.

(b) Separation. As used in § 374.105, the term “separation” includes, among other things, the display of any sign indicating that any portion of the terminal facilities are separated, allocated, restricted, provided, available, used, or otherwise distinguished on the basis of race, color, creed, or national origin.