The document you're looking for is likely titled "Standard Specifications for Roadworks" and was published in 2000. While I couldn't find a direct link to a PDF version, I can provide some general information on the contents of such a document.
If you are looking for specific technical values, I can help you find: for subgrade (MOD AASHTO) Grading envelopes for base course materials Concrete class requirements for drainage structures standard specification for roadworks 2000 tanzania pdf
It serves as a legally binding technical reference in construction contracts managed by Technical Consistency: It complements other vital manuals, such as the Pavement and Materials Design Manual (1999) Durability: The document you're looking for is likely titled