A safety system to prevent a wrong-way vehicle from entering a roadway by driving onto an exit ramp in the wrong direction. A detection system monitors and detects the wrong-way vehicle as soon as it enters the exit ramp in the wrong direction. Upon detecting a wrong-way vehicle, the roadway safety system remotely sends a signal to turn off the motor of the wrong-way vehicle. The system may also record the vehicle's identification and communicate it to a command center to determine the mobile phone number of the owner/driver and call the driver to alert them that they are driving the wrong-way. Alternatively, a series of one or more penetrable and/or impenetrable barriers could be deployed to stop the wrong-way vehicle. The safety system may further include a communications system to communicate to a central office to initiate other alarms and control traffic on the roadway in response to detecting a wrong-way vehicle.