Interstate 24 Hickory Hollow Parkway InterchangeDavidson County
The project along Interstate 24 at the Hickory Hollow Parkway interchange (Exit 60) in Davidson County involves modification and reconstruction of existing ramps and connector roads to create a full-access interchange. The modifications will transform the exit into a diverging diamond interchange (DDI). The unique crisscross design allows two directions of traffic to temporarily cross to opposite sides of the roadway in order to travel across the overpass, and then cross back and resume the original travel pattern. The DDI uses concrete dividers, stop bars, traffic signals, and extensive signage to guide motorists through the interchange.
Purpose and Need
The existing I-24/Hickory Hollow Parkway interchange was built in conjunction with the development of Hickory Hollow Mall in the 1970s. The interchange is currently a T-type or trumpet design, allowing access to Hickory Hollow Parkway, which is a four-lane, median-divided roadway between the interchange and State Route 254 (Bell Road).
This area, located southeast of Nashville, is one of the fastest growing areas of Davidson County. The planned interchange modifications will not only improve the safety and operation of the Hickory Hollow Parkway interchange, by improving access to both sides of the interstate, but it will also reduce the demand for Exit 59 (State Route 254/Bell Road). Additionally, the improvements will promote economic growth by providing accessibility to the southeast side of the interstate and the many existing and proposed commercial, retail, and residential developments.
The modifications to this interchange are included in the Nashville Area Metropolitan Planning Organization (MPO), 2035 Long-Range Transportation Plan (LRTP), and the Interstate 24 TDOT Corridor Study (March 2013). They are also included on the Major and Collector Street Plan (MCSP) for Nashville/Davidson County, Tennessee.
The above video explains the design and flow of the Diverging Diamond Interchange planned for I-24 at Hickory Hollow Parkway.
The I-24/Hickory Hollow Parkway interchange will be modified to a diverging diamond interchange (DDI) design to create a full-access interchange.
Existing ramps will be reconstructed to allow access to and from either direction of I-24 via Hickory Hollow Parkway. The westbound exit ramp will be extended. Two separate eastbound exit ramps and a dual-lane eastbound entry ramp will be built.
The interchange will provide three lanes in each direction on Hickory Hollow Parkway. Exit ramps will diverge from the through lanes, while entry ramps will merge with the through lanes. Two signalized intersections will be installed at either end of the widened overpass to control through traffic movements.
Pedestrian and bicycle traffic will be accommodated on a shared-use path within the median, with crosswalks at the two signalized intersections.
Two new public roads will be constructed to connect the interchange with local routes. Hickory Hollow Parkway will be extended to the south to tie in near the intersection of Cane Ridge Road and Old Franklin Road, and Williams Turner Parkway will be built to tie into the north end of Cane Ridge Road.
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