100 Years Evolution Of Traffic - 1910s Till The 2010s

A year after AESC was founded, it approved its first standard on pipe threads. Its next major project was undertaken in 1920 when AESC began the coordination of national safety codes to replace the many laws and recommended practices that were hampering accident prevention. The first American Standard Safety Code was approved in 1921 and covered the protection of the heads and eyes of industrial workers. In its first ten years, AESC also approved national standards in the fields of mining, electrical and mechanical engineering, construction and highway traffic.

100 Years Evolution of traffic - 1910s till the 2010s

Although the PA Turnpike was one of the safest in the country, the need for more safety improvements became apparent in response to a rising number of crashes. Improvements included better pavement drainage and stabilization, a 300-foot right-of-way, a 60-foot median, computerized Toll Points, plazas moved back away from the road, and curves added to the boring, straight stretches.By the early 1960's, a study of the traffic bottleneck at the two tunnels was undertaken and it recommended a 13.1 mile bypass that included reconstruction and relocation of the Breezewood Interchange and construction of a new east-west service plaza (Sideling Hill). The Sideling Hill By-pass opened on November 26, 1968, sending both the Ray's Hill and Sideling Hill tunnels into retirement. Portions of the vacated highway and the tunnels themselves still exist today and are used by the PA Turnpike for testing and research. 041b061a72