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3.
At night, police cars will sometimes be parked in 'hidden areas', such as behind a billboard or in a parking lot, and will be facing traffic looking for speeders or DWI cases. They may also be parked alongside the road or in the breakdown lane on the highway.

Ghost cars will always have their head lights off, but sometimes the day-running lights will remain on, giving the headlights a light 'ghostly' appearance. It is also sometimes used to refer to any ordinary car driving at night with no headlights or just their dayrunners on, but usually the title is reserved for police vehicles.
I passed under the bridge when I noticed two ghost cars hiding next to it, on the median, each facing a different direction.
by The Sub March 18, 2005
 
1.
a canadian slang term for an unmarked police car.
"I just got pulled over by a ghost car that looked like a mustang."
by jess1951851852 October 27, 2005
 
2.
An unmarked police car, easily recognizable by it's inconspicuousness.
Hey, look at that ghost car, it's got like 80 antennas on it.
by Mezziah January 08, 2007
 
4.
a screamer
bob, dude look for the ghost car

phil, ok

30 seconds later

phil,i will whoop your ass
by butt13377331wipe July 01, 2010
 
5.
Fun, if slightly irresponsible game played in a car at night time.

When driving down a country road at night, or anywhere without street lights, flick off the car headlights for a second. Looks cool when driving also freaks out anybody who happens to be around when you do it.
"you see officer it's a little game called ghost car......"
by dazco July 24, 2009
 
6.
Cop car with its lights off
I got nailed with a speeding ticket by a ghost car
by Shizzle Ma Nizzle September 09, 2003