• AISC Certified Simple Bridges
Being designated a simple bridge shop allows Di Highway Sign & Structure to produce a wide spectrum of bridge rail projects. We have produced rail for bridges as small as thirty foot culvert bridges or as large as the Ogdensburg Prescott Memorial Bridge. Being certified lets are customers know that they are purchasing a quality product from an experienced firm.
  • WBE Certified
WBE Certification simply states that Di Highway Sign & Structure is classified as a Woman Owned Business. If our customers are looking for the important minority credit for a contract that they are bidding they can purchase our material and earn 100% of the value for anything that Di Highway manufactures for them.

Quality Control

At Di Highway Sign & Structure, every fabricated product is thoroughly inspected for quality, prior to being shipped. We employ four AWS Certified Welding Inspectors in our QC Department. In addition to weld inspection, they are involved in management of the Quality System from project planning through certification. Our Quality Control Policy is to ensure that all fabricated products comply with the quality requirements, as prescribed by the customer through plans and specifications; and also to standards and quality control procedures as required by Di Highway, and International, Federal, State, and Local agencies. Di Highway is currently certified by the AISC for meeting the quality system requirements of "Certified Bridge Fabrication Simple." When QA (third-party) inspection is required by a specific contract, Di Highway will bring in a State inspector or a representative from an outside inspection agency to work with our Quality Control Department.


All of our welders here at Di Highway Sign and Structure are certified to produce product conforming to the following standards:

  • Flux Core Welding Process according to AWS D1.5 specifications
  • NYS DOT Steel Construction Manual