Two expressways with a total price tag of $3 billion and a construction schedule that could span 15 years have been referred to as "highways of hope" for the region around Pittsburgh in western Pennsylvania. The Mon/Fayette Expressway will extend about 70 miles south from Pittsburgh through the Monongahela River Valley and western Fayette County to Interstate 68 near Morgantown, W.V. The Southern Beltway will form a 30-mile arc around Pittsburgh between the Mon/Fayette and Beaver Valley expressways, with a radius of about 15 miles measured from Pittsburgh's Golden Triangle. The Pennsylvania Turnpike Commission and the Pennsylvania Department of Transportation have completed the first 18 miles of the Mon/Fayette. Seeking cost-effective ways to enhance the quality and safety of its new route, the commission has specified white concrete for all the mainline bridge parapets on both the Mon/Fayette and the Southern Beltway. The decision to use white parapets came from the recognition that more accidents per mile driven occur at night than during daylight hours. The first white parapets on the Mon/Fayette were constructed in September 1998, and the parapet work continues as the route is extended. A few parapets were cast in place in fixed forms, but on the longer bridges, they are being slipformed.