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David Mann (Weaver) is a middle-aged Los Angeles electronics
salesman driving his redPlymouth
Valiant on a business trip. On a two-lane
highway in the California desert, he encounters a grimy and
rusty Peterbilt
281 tanker truck, traveling slower than the
speed limit and expelling thick plumes of sooty diesel exhaust. Mann
passes the unsightly truck, which promptly roars past him and then
slows down. Mann passes the truck a second time and is startled when
it suddenly issues a long air horn blast.
The truck follows him into a filling station. While there, Mann
makes a phone call to his wife (Jacqueline
Scott), who is upset with him for not confronting
one of their friends at a recent party who was making a pass at her.
The gas station attendant mentions that Mann needs a new radiator
hose, but he disbelieves the attendant and refuses the repair.
Once both Mann and the trucker are back on the road, the truck
begins blocking Mann’s path each time he attempts to pass it. At
one point, the truck driver waves at Mann, indicating that he can
overtake. When he does, he almost strikes an oncoming vehicle. Mann
realizes the truck driver was trying to trick him into a fatal
collision. He passes the truck again, using an unpaved turnoutnext
to the highway. The truck soon begins to tailgate Mann at high
speeds—over 90 miles per hour (140 km/h)—forcing him to
maintain his speed to avoid being rear-ended. The chase continues
down a mountain road with the truck bumping him several times until
the Plymouth goes off the road, colliding with a guardrail across the
road from a diner. The truck keeps going.
Mann enters the diner (Chuck's Café) to compose himself. After
returning from the restroom, he is shocked to see the truck parked
outside the diner. Mann studies the diner patrons carefully and
begins an inner monologue in which he contemplates the driver's
motives and second-guesses his decision to sit helplessly in the
diner. Most of the patrons sitting at the counter give Mann the
impression of malice, but when one leaves, appearing to approach the
tanker, he instead drives away in a pickup truck. Mann eyes the
patrons again to try to identify his pursuer, and when he thinks he
has, he confronts him. The man he approaches (Eugene
Dynarski) is angered by Mann's accusations and
engages him in a short fist fight. After the fight is broken up by
the café owner, the falsely-accused man drives away in a livestock
truck; the tanker truck leaves a few seconds later, suggesting that
Mann's tormenter was never in the diner in the first place.
Mann leaves Chuck's Café and stops to help a stranded school bus,
but his front bumper becomes caught underneath the rear of the bus.
The truck appears at the end of a tunnel. Mann panics, manages to
free the Plymouth and flees, but then is puzzled to see the truck
helping the bus get moving. At a railroad crossing, the truck quietly
approaches Mann's car from behind and starts pushing the Valiant
towards a passing freight train. The train passes by just in time and
Mann crosses the tracks and pulls off the road. The truck passes him
by and disappears.
Mann then stops at Sally's Snakerama Gas Station to call the
police and refuel his Plymouth. Before he can complete the call, the
truck roars up and plows into the telephone booth, with Mann jumping
clear just in time. The truck proceeds to chase Mann as he is on
foot, destroying Sally's Snakerama and releasing several rattlesnakes
that had been caged on the premises. Terrified, Mann jumps into his
car and speeds away. Mann then hides behind an embankment off the
road and sees the truck pass by, apparently without noticing him.
After a long wait, Mann heads off again but is dumbfounded to see
that the truck is waiting for him just around the bend. Mann stops
his car and attempts to get help from an older couple in a car that
is cruising by. They think he is crazy and refuse to listen until
they see the truck themselves, and flee when the truck backs up
towards them at increasing speed. Mann returns to his car. The truck
eventually allows him to pass by and a high-speed chase begins. Mann
races up steep grades, putting some distance between himself and the
truck. However, his Valiant begins to overheat when its weak radiator
hose fails and the truck quickly begins gaining on him. Mann barely
makes the summit and coasts down the other side in neutral as the
truck bears down on him.
Descending at speeds too great to control, the Plymouth spins out
and impacts a rock wall. The truck speeds toward the damaged car as
Mann accelerates, drives up a dirt road, and turns to face his
opponent on a large hill overlooking a canyon. He places his
briefcase on the accelerator and steers his vehicle directly toward
the oncoming truck, jumping from the car at the last moment. The
tanker hits the car, which bursts into flames, partially obscuring
the truck driver's view. Too late, the truck's driver realizes he is
headed for the canyon and brakes hard. With a blast of the air horn
the truck plunges over the edge of a cliff into the canyon below.
Above the smoking wreckage Mann sits, exhausted, at the cliff's edge,
tossing stones into the abyss as the sun sets.
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