Green’s Dictionary of Slang

midway n.

[carnival/fairground jargon the Midway, the central avenue along which the major shows and amusements are situated. The term originated in 1893, when the Chicago Exposition featured the Midway Plaisance]

1. (US) the main street or streets of a town or city.

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[US]I.L. Allen City in Sl. (1995) 41: Carnies similarly projected a word image of their world, the midway, onto the main street of a town. Slang came to use it for any brightly lighted thoroughfare, especially an entertainment strip, such as Sunset Strip in Hollywood and The Strip in Las Vegas.

2. (US black) a hallway or corridor.

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[US]Eve. Sun (Baltimore, MD) 9 Dec. 31/5: Midway — a hall.
[US] ‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.