A vehicle includes a detection module including a directional antenna and signal processing logic. The horizontal upper-storage recess floor defines a cup-holder opening and a cup-holder recess is defined between cup-holder sidewalls of the storage bin that are supported below the cup-holder opening defined by the horizontal upper storage-recess floor. The adjustable bar can be adjusted to a shortened configuration to allow easy passage through a hole in a ceiling and the tubular member then rotated to force the joist engaging members into secure contact with the joists. An undoped region may be formed below the bottom surface of the T-shaped gate structure on a layer of the III-V compound semiconductor-containing heterostructure.