Abstract: A roadway barrier is provided for detecting a dangerous traffic condition. The roadway barrier includes a control module comprising at least one processor, a computer readable storage medium, and executable instructions stored on the computer readable storage medium; a display in communication with the control module; and at least one sensor oriented to measure data related to an approaching vehicle. The roadway barrier is positioned adjacent a safety zone such that the at least one sensor is oriented in a direction to detect traffic approaching the adjacent safety zone. The control module receives data from the at least one sensor related to a speed and direction of an approaching vehicle and determines, based on a speed, distance, predetermined reactionary response times, road surface drag factors and direction of the vehicle whether the stopping distance of the vehicle is estimated to be capable of stopping prior to entering the safety zone.