Seattle is among the fastest-growing cities in America, thanks largely to Amazon's addition of 35,000 employees since 2010. For all the economic benefits that come with growth, it has also created a variety of civic headaches, traffic chief among them.

But thanks in part to efforts by the region's largest employers, the share of commuters driving solo into downtown Seattle is on a dramatic decline. Just 25 percent of workers traveling into the city's center drove themselves, according to the results of the latest annual commuter survey by the Seattle Department of Transportation (SDOT) and its nonprofit partner, Commute Seattle. This is the lowest share since the city started keeping track in 2010.

The number of cars is also trending downwards, according to responses collected from 1,784 downtown workers. While Seattle has gained about 60,000 jobs since 2010, there are approximately 4,500 fewer single-occupancy vehicles. Overwhelmingly, new workers are choosing transit. The share of commuters headed downtown by bus or train shot up from 42 to 48 percent from 2010 to 2017, with about 127,000 such trips during the average morning rush hour. Bus trips (as anyone who's waited at a packed King County Metro stop on a weekday morning can attest) make up the vast majority of them.

Walking, biking, and carpooling also picked up by thousands of trips per day, according to the survey. Note, though, that ride-hailing services such as Uber and Lyft weren't explicitly identified as options in the survey, which comes from a state document that hasn't changed much since 1991. Respondents might have registered those trips as "drive alone," "other," or as "rideshare" (meaning carpool), but there is currently no way of telling.