Since 1996. ATSSA Membership. YDM is a member of the National Traffic Engineering Facility (Highway) Standardization (stipulating and revising standards of road safety products) Committee. We specialize in manufacturing traffic safety products. The range of products includes road stud, pavement marker, solar road stud, solar road marker, solar stud, swareflex road stud, aluminum road stud, road marker, road reflector, flexible delineator, plastic traffic sign, anti-glare screen and speed hump.