We come back to Roald Dahl with the story "The Hitchhiker". It was originally published in the July 1977 issue of the Atlantic Monthly, and later included in Dahl's short story collection The Wonderful Story of Henry Sugar and Six More. The story features a man who picks up a hitch-hiker whilst driving to London.
https://en.wikipedia.org/wiki/The_Hitch-Hiker_(short_story)
For an analysis of the story click HERE
And this is a short film based on "The Hitchhicker"