Specifications include, but are not limited to: The City is interested in selecting up to three consulting firms to provide on-call City-wide traffic impact study services on an as needed basis. The traffic impact studies will be completed for new site developments or site-redevelopments within the City of Des Moines. The studies are expected to provide an independent review of potential traffic impacts by a professional firm not otherwise involved with the site development project. In general, the City will work with the selected firms on a study-by-study basis to determine the types of services required. The consultants are expected to be able to work with City staff to obtain all necessary information to provide on-call traffic engineering services, as required. The services performed by the consultant firms may include, but are not limited to: traffic data collection, traffic operations analysis, crash analysis, traffic modeling, and multi-modal accommodations review. The studies will be on a defined schedule. Anticipated turn around requirements will include 20 working days to provide draft studies to the City.