Martin Luther King, Jr. Boulevard Street SignAn original street sign from Martin Luther King Jr. Boulevard in Los Angeles, California The double sided street sign measures 37. 5 x 12 x 2. 5 and weighs 14 pounds, including its original mounting bracket. The white reflective text reads Martin Luther King Jr Bl, 4900 W on both sides. Martin Luther King Jr. Boulevard runs for 7 miles through Los Angeles, from Obama Boulevard to South Alameda Street. It was originally called 40th Street, and then