Whenever any highway improvement involves structural work, dirt grading and traffic service gravel, graveling, stabilizing and oiling, or concrete surfacing, or any two or more of them, then wherever practicable and not contrary to any federal law or regulations, separate proposals and bids must be received on each separate type of work.
N.D. Cent. Code § 24-02-22
Separate proposals on each type of work
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.