Disclosed is a crashworthy post, which allows a post body to slide rearward along with a vehicle at the early stage of a vehicle collision, and simultaneously a compressive deforming pipe is compressed to dissipate impact energy.

Disclosed is a crashworthy post, which allows a post body to slide rearward along with a vehicle at the early stage of a vehicle collision, and simultaneously a compressive deforming pipe is compressed to dissipate impact energy.

A multi-piece bolt retainer system for use with a triangular slip base system for breakaway road sign installation is disclosed. The assembly includes a plurality of independent bolt retainer members each configured to engage and retain a respective bolt positioned between a top and bottom slip base plate. The modular configuration facilitates precise installation, uniform torque distribution, and predictable slip performance during vehicle impact.