This study explores the feasibility of camera-based work zone intrusion detection and alert technology through testing a prototype system at selected work sites and a training facility. The prototype system uses an Android smartphone to capture and process the video feed. When an intrusion event is detected, the smartphone generates audio alarms on a portable speaker and triggers alarms (both audio and vibration) on personal smartphones carried by workers. The prototype was tested during four test sessions that took place at different locations. One session took place in a closed training track facility while three sessions were conducted at actual work zones in active roadways. A survey questionnaire was administered at the conclusion of the test sessions. The survey instrument captured potential users’ opinions and perspectives about the useability of the prototype at actual work zones.