People came from across the country to drive four lanes with limited access and no stop signs or red lights for 160 miles, all the way from Irwin, near Pittsburgh, to Carlisle, outside Harrisburg. Miner, who is finishing a State Museum exhibit on the turnpike's construction, evolution and legacy, said, "People were astonished that we had pulled this off, that it was possible to get on a highway and drive uninterrupted for miles and miles and miles." [...] known as U.S.