In San Diego County, the largest local reductions in greenhouse gas emissions are likely to come from tighter fuel economy standards and state mandates for large-scale renewable power sources. Cars and light-duty trucks are by far the largest source of greenhouse gas emissions in the county, estimated at 46 percent of the total according to a 2008 study by the University of San Diego. County transportation infrastructure, including mass transit, is making positive development and is being coordinated to support smart-growth in the region.
Poway encourages the use of mass transit and car pooling by providing contract bus service and several park-and-ride locations.
Street maintenance is a high priority for the city, and the roadways are maintained at a very high quality.
Traffic signals are programmed to improve traffic flow, save time, fuel, and improve air quality.
The city's 127 vehicle fleet is maintained by Public Works at levels that exceed the average industry standards. Low sulfur fuel is used as a "green" environmental practice and to meet Air Resources Board regulations.