All pages should be single sided. • Use the Cover Page that is provided in the Bid Proposal (posted on the IDOT Web Site) as the first page.Proposals MUST be submitted electronically through the Vendor Bids portal save the document, prior to submitting electronically. • Check the correct box pertaining to Section 20-160 of the. All bidders shall include, with their bid proposal, the brand name, model or catalogue number and complete specifications of items they are bidding. A properlyprepared proposal shall consist of all bid proposal forms and all the required information as listed in the checklist. Proposals postmarked or time stamped after the bid closing will not be considered and will be returned unopened.