Wiktionary
ghost car
n. (context Canada English) An unmarked police car or an unmarked vehicle used as a decoy by police.
Usage examples of "ghost car".
If he were being followed, his tail was an invisible man in a ghost car.
A story about a ghost car was going pretty well until it hit the wall of my imagination and burst into flames.
Under the sun's glare not yet shadowed by the approaching clouds, the Impala seemed only a glimmer, a ghost car that would ramble through the Florida scrub toward a future thick with questions and grief.
Then he looked at the caved-in dashboard and found the reason for the vacant ghost car.