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Innovative TDM solutions for Southern California’s I-5 Corridor

San Diego Association of Governments (SANDAG)

The Interstate-5 North Coast Corridor (NCC) is among the most heavily traveled stretches of freeway in the United States. It currently experiences recurrent traffic congestion during the weekday rush hours and also experiences heavy traffic on the weekends. In 2012, planned infrastructure improvements along the 27 mile stretch of the I-5 corridor began that includes new Express HOV lanes, coastal rail and transit enhancements, and pedestrian and bicycle access improvements.

Our role

To complement and support infrastructure improvements including Express High Occupancy Vehicle (HOV) Lanes on the I-5, coastal rail and transit enhancements, and pedestrian and bicycle access improvements, Steer Davies Gleave led the development of the NCC Transportation Demand Management (TDM) Plan.

How we did it

The TDM plan will help reduce single-occupancy vehicle trips and encourage the use of more sustainable modes of travel, both during the construction phase to alleviate congestion, and over the long term to reduce capacity issues.

Assessing the current situation and conducting extensive market research with employers, schools, residents and other agencies along the corridor was crucial in determining the motivators that would prompt a change in travel behavior.

During times of high-density construction it is often the case that messaging about the works taking place and/or the alternative modes available to travelers are delivered by separate parties. This can result in people receiving varying levels of information and information that lacks consistency, and so it was important that the TDM Plan we developed for SANDAG ensured a coordinated approach along the North Coast Corridor.

The TDM Plan will provide multi-modal solutions that will help manage congestion during construction and act as a foundation for continued travel behavior change in the corridor. It includes a number of new initiatives such as: creating a web portal to provide real-time information for the public; using social media to encourage the use of alternative modes; and creating an employer outreach program, community outreach program and school engagement program.

The TDM Plan will be rolled out to a pilot area of the North Coast Corridor called University City in September 2014.

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