as one of the most controversial interstate highways in pennsylvania, construction of i-476 began in 1967, but was not completed until 1991 between macdade boulevard (exit 1) and interstate 76 (exit 16), and until 1992 between germantown pike east/chemical road (exit 19) and interstate 276/pennsylvania turnpike (exit 20), due to litigation between the pennsylvania department of transportation and several communities in the road's path over environmental concerns. however, the section of interstate 476 (south end of i-476) between i-95 and macdade blvd. (exit 1) was opened in 1987, but signage labeled it as a route "to macdade blvd" until 1991 when i-476/the blue route was opened between exits 1 and 16, and connected with the short existing section of roadway dating back to 1979 from exit 16-exit 19.