How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.Here, you'll find details about contracting opportunities, vendor qualifications, proposals and how to bid on projects. PlanHub allows you to see the current projects available for bid throughout Arizona. Check government websites for RFPs and associated bid proposal samples. Most ADOT bidding can be done online using Bid Express, a third-party website which handles construction bidding for many different entities, including ADOT.