National Trench Safety (NTS) specializes in the rental and sale of trench safety, traffic safety and related equipment and se ... rvices. NTS also provides OSHA compliant training courses for customers, as well as engineering services for site specific trench safety plans and site specific traffic safety plans. NTS has a national footprint with 29 branch locations from the East Coast to the West Coast in addition to its corporate headquarters in Houston, Texas. read more