Hear it all: trip routing with smart phones, stop sign impacts on safety, how rain affects bus travel times, transit agency equity analysis, and much more!

The best and the brightest of the Transportation Research Board's Annual Meeting!

David Levinson talks about the politics of research journals and his new book, "The 30 Minute City."

Talking about the early days of the conference and what it's meant to transportation in the United States over the last 25 years.