A new report co-authored by Martin Wachs, UCLA Luskin distinguished professor emeritus of urban planning, assesses California’s transportation revenue stream and the potential impact of a ballot measure to repeal the state’s gas tax. The tax was part of a law adopted in 2017 to fund road repairs and maintenance, along with new transit projects and infrastructure upgrades. Proposition 6, on the Nov. 6, 2018, ballot, would repeal the law and require voter approval for future increases in transportation-related taxes. The study by the Mineta Transportation Institute (MTI) at San Jose State University projects that, between now and 2040, California would lose approximately $100 billion in transportation revenue if Proposition 6 passes. “California’s ability to plan and deliver an excellent transportation system depends upon the state having a stable, predictable and adequate revenue stream,” said Wachs, lead author of the report. The study also measured voter sentiment about how to pay for transportation improvements. “Of clear importance to the public is assurance that the revenue is being spent efficiently and on things that they care about such as maintenance, safety improvement and programs that benefit the environment,” said Hannah King, a Ph.D. student specializing in transportation planning at UCLA Luskin. King is co-author of the report with Asha Weinstein Agrawal, director of the MTI National Transportation Finance Center.