Throughout the District, there are signs warning drivers to not block the box. My home commute path takes me up 12 Street and across Mass Ave. Every day, between the hours of 4:30 and 6:00, which is the range during which I've experienced this issue, drivers along Mass Ave will block the box, not allowing drivers along 12th Street to cross over Mass Ave. Often, I have to wait 2-4 light cycles in order to get past cars that continue to drive down Mass Ave, even when they have no room to do so. I would be immensely satisfied if I were to see a TCO at this intersection during my home commute this afternoon. And perhaps doing this on a regular basis would alleviate the blocking the box issues, as I am aware that this is a ticketable offense. Thank you in advance.