Tunnel profiles: Fort Pitt, Squirrel Hill, Liberty tunnels

Fort Pitt Tunnel

Year opened: 1960

Cost to build: $17 million

Length: 3,614 feet

Vehicles per day: 100,000

Major construction update:  Work will begin at the end of September to remove the tunnel ceiling, upgrade the lighting system, install new water line and pave in both directions. The majority of the work is expected to be finished by late 2015, with paving set for spring 2016. The project has not been bid yet.

Liberty Tunnel

Year opened:  1924

Cost to build: $6 million

Length: 5,889 feet

Vehicles per day: 35,000

Major construction update:  An $18.8 million project to paint, repair concrete, update the electrical system and refurbish the portal buildings is 90 percent complete and is expected to be finished by the end of September. 

Squirrel Hill Tunnel

Year opened: 1953

Cost to build: $18 million

Length: 4,225 feet

Vehicles per day: 94,000

Major construction update: A three-year, $49.5 million rehabilitation project is 90 percent finished and on track for completion in September. Work included removing the tunnel ceiling, updating electrical systems and installing new lighting, a new ventilation system, new wall tiles and new water line.

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