This is a very unusual and low-budget B/W adventure from producer Roger Corman, directed by skillful Nathan Juran; one whose creators do a neat variation on the old tale of people kidnapped by a fugitive heading to somewhere and needing their vehicle or themselves as hostages. I find the storyline is straightforward and classic noir. Scene:  a casino in Las Vegas, a marine just back from service Marine (Richard Conte), buys a drink for platinum blonde (Mary Beth Hughes), and somehow insults her; so they have a public quarrel but then reconcile the problem.  The following  day, he is taken in by the sheriff an named the prime suspect in the girl's demise; she has been strangled. Using his military skills, he overpowers the officers holding him and sets out on the "lam". Troopers are checking the highways for him, hence the title, and also the state border; So he helps and hitches a ride with with a two women who have had car trouble. One is wealthy fashion photographer from New York, Joan Bennett; her young assistant, Wanda Hendrix, is the other. After a while the two try to rid themselves of him, but he stays with them--finally having to use force to have his way. He heads for the town where he grew up, for a climax, finding it under the waters of the Salton Sea. The film ends happily for Conte, but not before Bennett's dog has been killed, and he has been doubted severely and tested to the limit.  The film is inexpensive-looking and has indifferent dialogue by  but the story line is good, clean and memorable. Roger Corman devised the original story; four others had hands in the screenplay. There is original music by Edward Kay and some decent but hardly outstanding technical work. In the cast along with the principals are stalwart Reed Hadley, Frank Jenks, Iris Adrian, Harry Harvey,Tom Hubbard (one of the writers) and others all showing to advantage. I first saw this film nearly fifty years ago; and it is still memorable and satisfying; with more money and better dialogue, I believe these actors and the director could have made a fine narrative even better.