The northern part of the mainline turnpike, along with the entirety of its extensions and spurs, is part of the Interstate Highway System, designated as I-95 between exit 6 and its northern end. South of exit 6, it has the unsigned Route 700 designation. There are three extensions and two spurs, including the Newark Bay Extension at exit 14, which carries I-78; the Pennsylvania Turnpike Extension (officially the Pearl Harbor Memorial Turnpike Extension) at exit 6 which carries I-95 off the mainline turnpike; the Eastern Spur and the Western Spur which split traffic between Newark and Ridgefield; and the I-95 Extension which continues the mainline to the George Washington Bridge in Fort Lee. All segments except for the I-95 Extension are tolled.