Working Beneath the Terrain: Advancing Roadway Safety in Tunnels

With portions of its system built on an unfinished, 1880s railroad project, the Pennsylvania Turnpike is home to several tunnels that help travelers navigate the state’s rugged, mountainous terrain.

Proactively monitoring the health of the tunnels along its system is critical to the PA Turnpike Commission’s commitment to providing a safe, reliable and customer-valued toll road system that supports national mobility and commerce.

While each tunnel has its unique challenges due to their age, traffic flow and geometric features – the PA Turnpike performs regular inspections, monitoring, maintenance and repair in support of their safety, structural integrity and operational efficiency.

The PA Turnpike’s Tunnels Have 24/7 Support and Coverage

Each tunnel has a dedicated team of employees who maintain their safe and efficient operation from offices carved into the mountainside above. Each of the PA Turnpike’s five tunnels are staffed by a supervisor, an operator, maintenance workers, tunnel guards and trade professionals.

This team actively inspects the tunnel's condition, manages traffic flow and addresses various issues. The tubes and supporting infrastructure (e.g., fans, air quality control systems, generators) are checked multiple times throughout each shift, as are ceiling tiles and nearby cellular antennae. Cameras and security systems are also closely monitored.

Technology Investments Are Advancing Tunnel Safety and Viability

Tunnel complexity is rooted in their 19th century railroad origins. However, the PA Turnpike’s decades-worth of technology investments advanced their safety and viability. This includes updated waterproofing systems, tunnel ventilation, state-of-the-art LED lighting, life safety systems, color and thermal CCTV cameras, sensors and automated gates.

The Pennsylvania Turnpike's 500-mile fiber optic broadband network – installed to support Open Road Tolling and provide improved opportunities for rural connectivity – also runs through the tunnels. Additionally, the network strengthens links among buildings, tolling points and devices while enabling advanced telecommunications applications.

The PA Turnpike Performs Annual Maintenance On Its Tunnels

Beyond addressing daily issues, tunnel teams perform scheduled maintenance such as cleaning and replacing tunnel system components, drains, grates, lighting, reflective tape and barrier skins, plus testing all fire hydrants and extinguishers.

The PA Turnpike cannot fully shut down a tunnel for scheduled maintenance, repair or renovation due to its impact on customers, toll revenue and, most importantly, the customer experience. Instead, our team performs work in tunnel tubes one at a time, often at night, to minimize customer and community impact. These scenarios require meticulous planning and coordination to maximize productivity.

They also present unique training experiences for local first responders. Contracted fire and EMS personnel, along with supporting agencies, are invited to perform walkthroughs and hands-on training. Often, they conduct tunnel-specific emergency scenarios for fires, rescue and towing operations.

PA Turnpike Tunnels Meet National Standards for Inspections

In accordance with National Tunnel Inspection Standards, each tunnel is also on a two-year assessment schedule and receives an in-depth evaluation of its civil, structural, drainage, electrical, lighting, mechanical, plumbing and fire/life safety systems.

Important Tips To Help Drivers Safety Navigate Tunnels

The following tips will help drivers safely navigate tunnels, including those along the Pennsylvania Turnpike.

When entering a tunnel:

Follow all state laws, which include turning on your headlights.
Stay in your lane.
Stay alert.
Maintain a safe distance from other vehicles.
Comply with all Hazardous Materials restrictions: Hazardous Materials Tunnel Restrictions | PA Turnpike

If involved in an incident inside a tunnel:

Turn on your hazard lights.
Remain in your vehicle if it is safe to do so.
If the vehicle can be safely moved, drive out of the tunnel, park on the shoulder and call *11.
If the vehicle cannot be safely moved, call *11 and wait for emergency responders.

During road work inside a tunnel:

Make sure your headlights are on.
Reduce your speed to 40 mph, the required speed limit for tunnel work zones.
Remain in your lane.
Slow down and pay attention.

Frequently Asked Questions About PA Turnpike Tunnels

How many tunnels are on the Pennsylvania Turnpike?
The PA Turnpike features five tunnels that help drivers navigate the state’s mountainous terrain safely and efficiently.

What should I do if my car breaks down in a tunnel?
If it is safe, remain in your vehicle, turn on your hazard lights, and call *11. If possible, carefully drive out of the tunnel before stopping on the shoulder.

Are hazardous materials allowed in PA Turnpike tunnels?
For safety reasons, there are many restrictions for transporting hazardous materials through Turnpike tunnels. Please visit Hazardous Materials Tunnel Restrictions | PA Turnpike

How often are Pennsylvania Turnpike tunnels inspected?
Each tunnel is inspected daily by on-site teams and receives a comprehensive, federally required inspection every two years.

How does the PA Turnpike keep its tunnels safe?
Tunnels are staffed 24/7 and supported by advanced technology, including LED lighting, ventilation systems, CCTV cameras, and sensors. They also undergo routine maintenance and inspections that meet National Tunnel Inspection Standards.