Arizona Natoosha Sheriff Lyle Wallace, also known as "Dirty Lyle", is the main antagonist of the 1978 film Convoy.

He is portrayed by the late Ernest Borgnine.


Dirty Lyle is first heard on the radio as another "trucker" who tells the others to increase their speed and extorts them for $70 each. He later gets in a bar fight with Spider Mike, who was desperate to get home to his pregnant wife.