by Matt Rosenberg January 29th, 2013
Each weekday about three million Washingtonians travel to work. A detailed performance metrics report presented last week to the Washington State Senate’s Transportation Committee finds that nearly three-quarters of those trips are by solo drivers. About 2.2 million or 73 percent drove alone to work in 2010, up slightly in percentage terms though not in raw numbers from 2008. More than 10 percent of Washington work trips were via carpool in 2010. Another 5.4 percent were by transit; 5.6 percent were classified as taxi/motorcycle/bike/walk/other; and 5.3 percent of workers, or telecommuters, travelled only down the hall to their home office to start the work day.
The report says that one objective for the state is to “reduce the percentage of commuters who drive alone to work.” That measure has become an increasingly central baseline indicator of transportation impact on the environment. Compared to solo commutes, carpooling, biking, walking and transit use are considered greener alternatives because there are typically fewer greenhouse gas emissions per passenger. As more and more jobs move away from downtown cores, it becomes more difficult for regions to reduce solo work commutes. However, improving vehicle mileage and continued market penetration of electric vehicles can also help limit the environmental effects of solo work commuting, as can increased telecommuting.
The “mode split” data on commuting are among a range of indicators on mobility, safety, and environmental impacts in the “2012 Biennial Transportation Attainment Report” from the Washington State Office of Financial Management.
According to the OFM report, walking accounted for 3.49 percent of trips to work by Washingtonians in 2010 and biking for 0.91 percent. This is versus 3.42 percent and 0.69 percent, respectively, in 2007.
The report also looks at transit ridership in the four counties of Central Puget Sound, King, Pierce, Kitsap and Snohomish. The overall five year-trend is a 13.3 percent increase, but “with job losses and depressed economic activity between 2008 and 2010, transit ridership dropped 3.3 percent,” the report says.