This hour, host Meghna Chakrabarti gets a preview of tonight's State of the State address with WBUR reporter Steve Brown. We also talk to Northeastern professor Peter Furth about Boston Mayor Marty Walsh's plan to bring "cutting-edge" traffic lights to Boston's busiest streets. And, WBUR legal analyst Nancy Gertner explains the challenge to the Massachusetts ban on assault weapons. Finally, we talk to Mary Mazzio, a former lawyer, turned film director about her documentary about sex trafficking, "I Am Jane Doe." We also speak to a mother of one of the Jane Doe victims.