2021 Standard Specifications 2021 Standard Specifications Memo Summary of Revisions for Standard Specifications 2021 Standard Specifications for Road and Bridge Construction 2021 Spec Book Order Form 2021 Supplemental Specifications 100 SS (Rev. 08-21-23) 400 SS (Rev. 12-19-22) 500 SS (Rev. 12-19-22) 600 SS (Rev. 12-19-22) 700 SS (Rev. 12-19-22) 900 SS (Rev. 01-30-23)