Highway To Hell: ROAD GAMES(1981)

The film opens on truck driver Patrick Quid (Stacy Keach) as he pulls into a motel for the night. Quid notices a man in a green van checking in with a female hitchhiker he had passed earlier because the trucking company policy forbids it. Nevertheless, Quid is upset at the man for taking the last room in the motel and picking up the attractive hitcher. In the motel, the hitcher strums a guitar naked on the bed, while the unidentified man unpacks a new guitar string. He winds the string around his gloved hands and uses it to strangle the woman.

via TheTVDB