 The WTOP Traffic Center. Tracking the top trouble spots. The biggest backups. The major incidents. The slowest traffic. WTOP Traffic. Every 10 minutes, on the 8th, and when it breaks. 1223, quite a mess overnight in DuPont Circle after a truck crashed into an office building. DC Fire and EMS telling us it happened just after 2 this morning along Connecticut Avenue near R Street NW.