It happened to Johnny Horton, these kinds of accidents have happened to many.
Too many. Among musicians, road accidents also killed, among others . . .
Carl Albert (Vicious Rumors)
Clifford Brown (virtuoso jazz trumpeter)
Duane Allman (if you have to ask . . . )
Jack Anglin (Johnnie & Jack)
Junior Barnard (Western swing/jazz guitarist)
Alan Barton (Black Lace singer)
Stiv Bators (singer with punk legends the Dead Boys and the Lords of the New Church)
Chris Bell (Big Star guitarist)
Jesse Belvin (rhythm and blues singer)
Chu Berry (jazz saxophonist, notably for Count Basie)
Marc Bolan (songwriting mastermind of T. Rex)
Jake Brockman (musician with Echo & the Bunnymen)
Bob Burns (a drummer for a later edition of Lynyrd Skynyrd)
Cliff Burton (original bassist for Metallica)
Harry Chapin (singer/songwriter)
Eddie Cochran (rock singer)
Joey Covington (Jefferson Airplane drummer)
Steve Currie (T. Rex bassist)
Joel DiGregorio (Charlie Daniels Band keyboardsman)
Gus Dudgeon (British producer whose credits included John Mayall, Savoy Brown, and Elton John)
Jerry Edmonton (Steppenwolf drummer)
Richard Farina (folk songwriter)
Pete de Freitas (Echo and the Bunnymen drummer)
Keith Godchaux (Grateful Dead keyboardsman)
Gus Hardin (country singer)
Michael Hedges (New Age guitarist/composer)
Bertha Hill (blues singer)
Vernon Isley (The Isley Brothers)
Johnny Kidd (British singer who wrote "Shakin' All Over")
Scott La Faro (jazz bassist, remembered usually as a member of Ornette Coleman's groundbreaking free jazz quartet)
Martin Lamble (Fairport Convention drummer)
J.B. Lenoir (blues guitarist/singer/songwriter)
Meade Lux Lewis (jazz pianist and boogie-woogie legend, most famous for "Honky Tonk Train Blues")
Lisa Lopes (R&B singer with TLC)
Ira Louvin (of country's Louvin Brothers)
Rushton John Moreve (Steppenwolf bassist; co-writer of "Magic Carpet Ride")
Berry Oakley (the original Allman Brothers Band bassist)
Cozy Powell (drummer for Jeff Beck, Whitesnake, others)
Cowboy Slim Rinehart (country singer)
Rockin' Robin Roberts (Pacific Northwest rock and roll legend)
Bessie Smith (blues legend)
Ted Taylor (R&B singer with the Cadets)
Ben Tucker (jazz bassist who recorded with Grant Green, Dexter Gordon, Quincy Jones, Kenny Burrell, Mose Allison, Herbie Mann, and Gerry Mulligan, among others)
Doug Watkins (jazz bassist whose credits included Donald Byrd and Jackie McLean)
Dottie West (country music legend)
Clarence White (guitarist for the latter-day edition of the Byrds)