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For years, it was the best-kept secret of the Central Artery Tunnel: A system of shortcuts and tucked-away roadways that led magically to the Ted Williams Tunnel, an express pipeline to the airport.
But now, state officials are letting the cat out of the bag.
Since the start of the three-month closure of the Callahan Tunnel in late December, Massachusetts Department of Transportation officials have been encouraging drivers — with bright orange detour signs, blog posts, and electronic message boards — to utilize a system of little-known shortcuts, high-occupancy vehicle lanes, and bypass roads to more quickly reach the airport.