Navistar International Corp. announced updates to its WorkStar line of vocational trucks at the World of Concrete Show. The lineup will add selective catalytic reduction emissions technology in May, Navistar said, one month after SCR is slated to debut on the manufacturer’s ProStar line. The WorkStar will also add 96-inch break-away mirrors this year, which Navistar said minimize cab and door damage from low-speed collisions.