The Pennsylvania Department of Transportation, better known as PennDot, operates the fifth largest state-owned highway system in the nation. With 25,000 bridges and more than 40,000 miles of state highway, we're talking more miles of highway than New York and New England combined. The state's secretary of transportation oversees the organization's 12,000 employees and $5 billion budget, and also administers grant programs for mass transit, rail freight and aviation. What are PennDOT's current challenges and how can the department balance the demand for new projects with budget constraints and community interests? We speak with Allen Biehler, Pennsylvania's Transportation Secretary since 2003. He has 34 years of experience in transportation engineering, planning, construction administration and public transportation management. Later in the show, we'll hear from the author of "The Slate Roof Bible". Joe Jenkins is an authority on the restoration of historic slate roofs. Guests: Allen Biehler & Joe Jenkins