One of da "four-wheeled" members of Lightning McQueen's non-human-based world; he's a talk-show host and great pal of fellow radio/TV-personalities Bob Cutlass, Darrell Cartrip, and Jay Limo.
Kidding aside, "Highway Carr" really is what I'd originally thought this radio-personality dude's "stage" name was when I first heard him on the radio, since the otherwise-clearly-speaking Howie usually pronounced his first name rather poorly. Same goes for the also-famous-in-radio (or should I say, "infamous", since he was eventually exposed as a Bernie Madeoff-type fraudster who bilked investors out of more than $24 million) Sonny Bloch, whom I'd always assumed was using the pseudonym "Sunny Block" merely to tout his financial advice, the implication being that following his investment-recommendations would "land you on a nice cheerily-bright street".