transportation access; convenience of access
Refers to how easy it is to reach a place by car, train, bus, etc. Often used when evaluating locations for living, travel, or business.
This hotel is close to the station and has good transportation access.
Living in a place with poor transportation access is tough.
Compound of 足 (foot, transportation) + の (possessive particle) + 便 (convenience, facility). The exact historical derivation is uncertain, but the phrase is a natural extension of the meanings of its parts.