A flashing video sign on I-80 in Hackensack offered drivers something more suggestive than the routine safety message on Sunday after someone hacked into the control box.

A Facebook video posted Sunday afternoon showed the sign parked on I-80 near Exit 65 in Hackensack flashing the message and displaying a phone number to passing traffic.

Caution: This video has adult language.

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The sign board belongs to a contractor who is working on a state Department of Transportation project, said Dan Triana, a DOT spokesman.

“Someone vandalized the portable variable message sign and changed the message,” he said. “NJDOT contacted the contractor as soon as we were notified and directed the contractor to remove the message and secure all boards, which was done shortly thereafter.”

A call to the number listed on the video sign was answered by an answering machine.

DOT officials told the contractor that the control boxes of all portable video signs must be locked to prevent future vandalism.

Larry Higgs may be reached at lhiggs@njadvancemedia.com. Follow him on Twitter @commutinglarry. Find NJ.com on Facebook.