It's a terrifying thought; you're driving down the freeway and somebody is going the wrong way coming towards you.
It's why ADOT is testing cameras and radar to help catch wrong-way drivers.
"The radar works with incoming detection of a car in the wrong direction on the offramp," said Doug Nintzel.
That signals flashing lights to go off, telling the driver he or she is going the wrong way.
There are blinking lights, of course, but there is also much more to this technology to catch up to wrong-way drivers.
"There is a camera and outbound radar that will detect the vehicle, take photos, send to whoever is receiving at ADOT and the Department of Public Safety," said Nintzel.
And ADOT could then post warnings on the overhead freeway signs.
Drivers FOX 10 spoke to is hoping this test is a success.
"I think it is way safer as long as it tells people there is somebody driving the wrong way, to stop it from happening, it would definitely work," said Gabriel Gonzales.