Boston’s streets and sidewalks comprise 9 square miles in a city that is only 48 square miles in total. Chris Osgood, with the odd but apt title of Boston’s chief of the streets, is the person in charge of not only maintaining that infrastructure but making sure that residents have access to it whether they drive, bike, or walk.

Osgood, joined by Vineet Gupta, the director of policy and planning for the Boston Transportation Department, and Josh Fairchild and James Aloisi of Transit Matters, said on The Codcast that his charge from Mayor Marty Walsh is to find ways of incentivizing commuters and residents to rely less on their cars and to take advantage of other modes of transportation that help reduce greenhouse gases.