ASIN: B00DVZFU06
Publisher: Amazon Digital Services LLC
Pages: 349
Pennsylvania was one of the first states in America to create a Highway Department and in the 1930s plans were undertaken for a new type of road to cross the Commonwealth - The Pennsylvania Turnpike. It was a revolutionary undertaking. Before the Turnpike roads had been built with flat curves to discourage speeding. Now the engineers were tasked with adapting the roadway for high-speed travel. There would be long, sweeping curves and a maximum grade of 3% or three feet of climb for every 100 feet of road. Before the coming of the Pennsylvania Turnpike it was not unusual to find mountain roads with grades of 12%. There would be no cross streets, no traffic signals, no railroad grade crossings. By contrast the Lincoln Highway (now Route 30) that was the main artery across Pennsylvania at the time sported 939 cross streets and 12 railroad crossings. it was expected that the new ...
