The Efpalinos Tunnel (Greek: Σήραγγα Ευπάλινος) is a tunnel on the Athens-Corinth section of the A8 motorway. Works began in 1999 as part of the construction of the Kakia Skala pass, one of the most dangerous road parts in Greece, with motorway standards. It was one of the first tunnels of the A8, and it was the longest tunnel of it until the Panagopoula Tunnel became operational in 2017. It was opened to traffic in July 2004, along with the rest of the motorway segment in time for the Athens Olympics.

Efpalinos Tunnel
Overview
LocationWest Attica, Greece
Coordinates37°58′39.8″N 23°17′04.0″E / 37.977722°N 23.284444°E / 37.977722; 23.284444
StatusOperational
Route
Operation
Work begun1999
OpenedJuly 2004
OperatorOlympia Odos S.A.
Trafficautomotive
CharacterSingle-tube motorway tunnel
Technical
Length1,700 m (5,600 ft)
No. of lanes3

References

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