Janette Sadik-Khan discusses her experience as Commissioner of the New York City Department of Transportation, focusing on smaller projects like plazas and bike access, instead of megaprojects that cost millions. She also discusses how you actually get things done in a city full of 8.5 million people, and the importance of data in persuading people to support new initiatives.

Ms. Sadik-Khan's new book is Streetfight: Handbook for an Urban Revolution and it's well worth a read.