The San Francisco Municipal Transportation Agency (SFMTA) has a new director of transportation, Jeffrey Tumlin. Tapped by Mayor London Breed earlier this month, Tumlin will be the agency's fifth director when he begins the job on Dec. 16. The SFMTA currently has a $1.2 billion annual budget, employs more than 6,000 people and serves about 714,000 passengers each day. We'll talk to Tumlin about his plans for the agency, including his pledges to fill bus driver shortages and fix the subway, and we want to hear from you: what are your biggest issues with the SFMTA and what are your hopes for this new chapter of leadership?