The group's principal activities are to develop, manufacture and market energy-absorbing highway crash cushions and other highway safety products for the protection of motorists and highway workers. the group also manufactures plastic components for industrial products. roadway safety service, markets highway crash cushions and highway information systems, inc., manufactures and markets highway advisory radio systems. during fiscal 2002, the group acquired surface systems, inc. the group operates in domestic as well as international markets. highway safety products accounted for 75% of fiscal 2002 revenues and highway information systems, 25%.