Weather watcher 5.6.538/13/2023 ![]() ![]() PennDOT engineers have tried to lessen this effect by installing brighter lights at the tunnel entrances to hasten eye adjustments, but the tunnel’s traffic flow is also hampered by ramps Jalopnik rated as the 2nd worst in the U.S. Traffic still notoriously slows due to the perception change of approaching and entering the tunnels, an effect known as “optical flow,” where visual cues trick drivers into assuming they are driving faster than they actually are. ![]() PennDOT had received estimates from contractors that surpassed $100,000, but Stancil’s group did it at minimal cost, about $15,000 for Fort Pitt Tunnel.īeing able to enjoy their favorite songs during their tunnel transits has done little to alleviate the common frustrations of Pittsburgh drivers, however. An overheight truck detection system and traffic signals have been added to each entrance.īeginning in 2000, a group of Carnegie Mellon University students under the leadership of professor Dan Stancil installed wires in the Squirrel Hill and Fort Pitt tunnels to ensure AM-FM radio and cell reception. The exteriors are clad in sandstone and brick veneers, with louvered openings and glass block windows. ![]() Each portal building is essentially the same, though the West Portal Building has a basement underneath. The Tunnel Portal Buildings house maintenance garages and control rooms for the exhaust and ventilation systems. The new tunnels had 2,312 light fixtures with 4,624 bulbs and eight ventilation fans (four in each portal building) to keep air moving and avoid the buildup of fumes that had nearly caused a disaster in the Liberty Tunnels. Squirrel Hill Tunnel The Squirrel Hill Tunnels opened to traffic for the first time after a ribbon-cutting ceremony on June 5, 1953, marking the completion of PennDOT’s single most expensive road project to that date.
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