Preferential Treatment for Carpools in Managed Lanes Facilities

Task leader in a Texas Department of Transportation research project which defined the role of carpools in priced managed lanes and the tradeoffs between carpool exemptions and other project objectives. Increasingly, project objectives are reflecting not only mobility concerns but funding deficiencies and the need to generate revenue. As a result, allowing exempt users such as carpools requires an evaluation of revenue impacts as well as mobility interests such as person movement, operations, and emissions. This research project identified the benefits, drawbacks and tradeoffs of providing preferential treatment for carpools and vanpools in managed lane facilities. The research David conducted included a review of the state-of-the-practice in carpool preferences, a stated-preference survey of regional commuters with respect to carpool preferences relative to price, review and advice towards development of a predictive demand model, and an assessment of mobility, revenue, and environmental impacts.

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