The SD-691 Pavement Marking System provides a safe and efficient method for applying 3M™ Stamark™ High Performance pavement marking tape to road surfaces. The SD-691 is designed to be a ride-on, self-propelled pavement marking tape application system. As compared to a walk-behind application unit, the SD-691 allows your operators to get off the road and away from traffic. Without the need for manual application, the system allows you to complete more projects in a shorter amount of time increasing your productivity and giving you an advantage over your competitors.