OPSD 992.210 - Intermediate Sign Support System, Slip-Safe Supreme Rib-Bak Breakaway System, Installation-Double Post Assembly
OPSS.MUNI 709 - Permanent Intermediate Signs and Support Systems
Other Standards
NCHRP 350 TL-3 - Recommended Procedures for the Safety Performance Evaluation for Support Structures, Work Zone Traffic Control Devices and Breakaway Utility Poles