Transportation Demand Management and Parking
Transportation Demand Management (TDM)
Transportation Demand Management (TDM) is the general term used for strategies to encourage people to more efficiently use all modes of the transportation system. Because our existing system tends to prioritize single-occupancy vehicles, TDM often takes the form of programs targeted at reducing inefficient car trips during peak travel hours – programs like carpool matching, transit subsidies, or bikesharing, for instance.
In Portland, the city requires that all commercial or institutional development of a certain size include a TDM plan complete with strategies to reduce single-occupancy trips. Meanwhile, the city is working to provide infrastructure – both programmatic and physical – to underpin this work from the private sector. The city’s bicycle and pedestrian network, transit system, and complete streets policy, for example, all create more travel choice for Portland’s residents and visitors, and in the end, a more connected and sustainable city.
The City of Portland has completed various plans over the past decade that touch on parking, particularly in areas of Downtown. In late 2016, the city began an effort to better understand the existing and future parking dynamics in Downtown, the Old Port, and the Eastern Waterfront, areas that are experiencing increasing development pressure and where parking concerns are often identified. The resulting technical study, the City of Portland Parking Study for Downtown, the Old Port, and the Eastern Waterfront, inventoried existing parking supply, measured existing parking demand, and estimated future supply and demand based on current development projections. The study ultimately recommends that the city undertake a number of measures to first and foremost address peak parking demand. The study also recommends measures to better understand existing patterns of parking use and more efficiently manage the existing parking supply.