Quantify Demand Management Effectiveness

Reducing impacts on the transportation system, air quality, energy use, and travel costs, while still preserving mobility options. Our TDM+ tool quantifies TDM effects in less time and for a more refined geographic scale than other available models, and can address TDM questions for an individual development site up to a neighborhood level.

Can we satisfy our jurisdiction’s vehicle trip-reduction policy by offering transit passes to our employees, or should we also institute a carpool matching program? What would be the effect on vehicle usage if we design our project to increase accessibility by transit and bicycles? The transportation planning field has developed a wide array of strategies designed to reduce trip-making by private automobiles. Collectively known as Transportation Demand Management (TDM), these strategies aim to reduce impacts on the transportation system, air quality, energy use, and travel costs, while still preserving mobility options. But the field has long struggled with having enough reliable data in a usable format to allow us to confidently answer questions about the real-world effectiveness of most TDM strategies.

Recently, Fehr & Peers helped the California Air Pollution Control Officers Association (CAPCOA) to develop a groundbreaking and comprehensive set of guidelines for assessing and quantifying reductions in vehicle miles travelled (VMT) and greenhouse gas (GHG) emissions associated with more than 50 TDM strategies, both individually and in combination. The strategies covered a wide range of measures, from increasing transit frequency to implementing road pricing to encouraging location-efficient land uses, as well as more traditional TDM measures like ride-sharing programs and parking cash-out. Then, working with the Bay Area Air Quality Management District, the evaluation methods were validated by comparison to the actual performance of trip reduction strategies in the San Francisco Bay Area. Fehr & Peers has collaborated with clients as varied as the USEPA, the California Air Resources Board, the American Public Transit Association, the California Housing and Community Development Department, and the Urban Land Institute in developing and validating these methods.

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Sarah Peters

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For More Information, Please Contact
Jerry Walters

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