Transportation contractors should rally behind the Infrastructure Investment and Jobs Act.

Engineers' group gives a C- grade, but key category did worse this time; advocates are hopeful big US investment will happen

Proponents include construction, labor, transportation, environmental, and clean-energy groups.

Construction groups now hope to see substantial infrastructure funding in a future, as yet undrafted, bill.

 DOT secretary says focusing on transport bill as main infrastructure measure may be easier than tackling two bills.