to a high of 70 mph on the Pennsylvania Turnpike around outer parts of Pittsburgh and Philadelphia. In 1940, when the Pennsylvania Turnpike was opened between Irwin and Carlisle, the entire 160 mile limited-access toll road did not have a speed limit, similar to that of the German Autobahns. In 1941, a speed limit of was established, only to be reduced to during the war years (1942–45). After WWII, the limit was raised to 70 mph on the four-lane sections, with the two-lane tunnels posted at for cars and for trucks. Prior to the 1974 federal speed limit law, all Interstates and the Turnpike had a speed limit on rural stretches and a speed limit in urban areas. In 1995, the state raised the speed limit on rural stretches of Interstate Highways and the Pennsylvania Turnpike system to , with urban areas having a limit. In 1997, PennDOT raised the speed limit on some rural non-Interstate Highway bypasses to . In 2005, with the change in the designation of "urban zones" in the state, the entire lengths of both the Pennsylvania Turnpike's east–west mainline and Northeast Extension were given limits, except at the tunnels and through the winding eastern approach to the Allegheny Mountain Tunnel. The 70 mph speed limit was authorized by House Bill 1060, which was signed by Governor Tom Corbett on November 25, 2013. On July 18, 2014, the Pennsylvania Turnpike Commission announced the return of the 70 mph speed limit on a 97-mile stretch of the mainline from the Blue Mountain interchange (MP 201) to the Morgantown interchange (MP 298). Signs were erected on July 22, 2014. On July 23, 2014, PennDOT announced the speed limit will be increased to 70 mph on I-80 between interchange 101 in DuBois, Clearfield County and milepost 189 in Clinton County and on I-380 between interchange 8 (MP 10) near Mount Pocono, Monroe County and the junction with I-84 in Lackawanna County, on or around August 11, 2014, as a pilot project. On March 15, 2016, the Pennsylvania Turnpike Commission approved raising the speed limit on the remaining sections of the turnpike to ; sections that were posted at would retain that speed limit. A total of of the Pennsylvania Turnpike system increased from , including the extensions in Southwestern Pennsylvania. The speed limit remains within construction zones and tunnels, at mainline toll plazas, on the eastern approach of the