Pennsylvania Turnpike

• The official PA Turnpike maps and reference page
• Toll Revenue with PDFs of revenue going back to 2010
• Simplified map of the Turnpike (PDF)
• Interactive map of the Turnpike
• Pennsylvania Turnpike on Wikipedia
• The Abandoned Pennsylvania Turnpike on the section(s) that have been rerouted since the Turnpike's origination (Wikipedia)

On the tunnels

• The Abandoned Pennsylvania Turnpike Tunnels and How to Find Them
• Tunnel Vision - an article about the Turnpike and how the tunnels are expensive to repair or bypass
• Allegheny Mountain Tunnel now used by the Turnpike (Wikipedia)