Interstate 840 West

Advancing west from Interstate 65, I-840 flattens out across an agricultural area beyond U.S. 431 and the West Harpeth River.
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Back to back lane drops occur along westbound I-840 leading into the folded diamond interchange (Exit 30) with U.S. 431 (Lewisburg Pike).
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U.S. 431 comprises a local route north into the Williamson County seat of Franklin and south to the settlements of Harpeth, Duplex and Rally Hill.
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Exit 30 loops away from I-840 west to U.S. 431. U.S. 431 travels 27 miles south to combine with U.S. 31A along a bypass of Lewisburg.
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Interstate 840 crosses a series of four bridges west over Tom Anderson Road, the West Harpeth River, and its associated tributaries.
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U.S. 31 splits with U.S. 431 along an at-grade bypass of Franklin (Mack C. Hatcher Memorial Parkway) to run south 6.7 miles to I-840 at Exit 28.
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A third westbound lane opens along I-840 west to the diamond interchange (Exit 28) with U.S. 31. This section of I-840 was completed in 2001.
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U.S. 31 continues south from Spring Hill to the Maury County seat of Columbia. U.S. 31 mirrors the I-65 corridor southward to Birmingham, Montgomery and Spanish Fort, Alabama and north to Nashville. The route splits into east and west branches from Music City USA to Louisville.
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U.S. 31 heads south to Thompson's Station before crossing Duck River Ridge into the city of Spring Hill.
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Interstate 840 west from U.S. 31 (Columbia Pike) toward Burwood opened to traffic on November 2, 2012.
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Interstate 840 straddles the Thompson's Station town line west toward Exit 23 with SR 246 (Carters Creek Pike).
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I-840 navigates through an S-curve across Murfrees Fork to the diamond interchange (Exit 23) with SR 246 at Burwood.
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Continuing west from Burwood, Interstate 840 travels across Johnson Hollow.
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I-840 traverses Duck River Ridge 21 miles ahead of the exchange with Interstate 40 near Dickson.
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Natchez Trace Parkway crosses paths with I-840 east of Smarden without direct access. SR 46 links the two roads five miles to the east of Exit 14.
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Interstate 840 enters the northeastern corner of Hickman County for just 1.38 miles.
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Heading north, I-840 enters Dickson County, 5.24 miles from Interstate 40.
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Interstate 840 converges with I-40 in a rural area east of Dickson.
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The directional cloverleaf interchange with I-40 includes a section of unused roadway built for the planned continuation of SR 840 north.
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Exit 1B departs in a half mile for Interstate 40 east into Nashville.
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Dickson lies west along Interstate 40 at the succeeding exit.
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Two lanes continue onto I-40 west toward Jackson and Memphis from Exit 1A.
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Milepost zero for I-840 stands at the centerline of Interstate 40.
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The unused roadway for I-840 extends northward to the overpass along Exit 1A.
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