One of the fundamental “claims” of the Columbia River Crossing is that by reducing backed up traffic, air quality will improve. This week’s PSU seminar tackles whether that assumption in transportation projects holds true.
Portland State University
Center for Transportation Studies
Spring 2011 Transportation Seminar Series
Speaker: Alex Bigazzi, Portland State University
Topic: Can Congestion Mitigation Reduce Emissions?
Abstract: Policy-makers, researchers, and activists often assume that traffic congestion mitigation results in reduced motor vehicle emissions without proper justification or quantification. This research investigates under which conditions that assumption is valid by comparing trade-offs between increased efficiency and induced travel. Analyses include investigation of varying vehicle fleets – including advanced-drivetrain vehicles. Results demonstrate that higher levels of congestion do not necessarily increase emissions, nor will congestion mitigation inevitably reduce emissions. These results apply for both roadway capacity expansions and traffic flow improvement projects. We compare the emissions effects of various congestion and emissions mitigation strategies, with particular attention to the roll of trucks and the potential of truck-only facilities. Congestion performance measures are also compared for applicability to emissions trends.
When: Friday, June 3, 2011, 12:00 – 1:00pm
Where: PSU Urban Center Building, SW 6th and Mill, Room 204