Manhattan-based HopStop, a mobile and Web-based resource for getting from points A to B without a personal car, compiled numbers derived from user searches to create a sort of "state of mass transit" infographic.

Here's a taste: The average transit time among HopStop users is 36 minutes, 49 seconds, a journey defined by an average mass transit time of 31 minutes, 31 seconds, plus an average walking time of 5 minutes, 18 seconds. The city with the longest average commuting time? Chicago. Longest average taxi trips? Philadelphia. Best biking city? Washington, D.C. (More transit trivia can be found here.)

HopStop collected its data from searches on its Web site and mobile apps. Users enter a starting and destination address and select the preferred mode of transportation--subway or rail, bus, taxi, biking, walking or car by hour services, such as a zip car. Results often include a combination of modes of transport, such as walking instructions to a subway stop as well as instructions on which subway to take and where to get off.

HopStop says that it sources schedules, stations, stops and timetables from transit agencies in 68 metropolitan market. Street-level mapping data is provided by Navteq, a data licensing partner. The company says that it tracks 400 million different routes for a total of 2.25 billion miles.

Of course HopStop, which launched in 2005, is not the only company to offer directions for car-less commuters. Because many mass transit agencies make their data available to app developers, there's a mini-industry of mass transit apps. Go to the Apple App Store and search for MTA—short for New York City's Metropolitan Transit Authority—for a glance at the number of iOS apps available for New York City commuters alone.