Monday To Be Busiest Mailing Day Of 2013 For USPS Monday, Dec. 16, is expected to be the busiest mailing day of the year for the United States Postal Service.
I-405 In LA Named Busiest Interstate In Any U.S. CityFederal transportation officials confirmed Tuesday what drivers in Southern California have known for a long time: the 405 Freeway is the busiest in the nation.