SR 266 begins in Rutherford County in Smyrna at an interchange with I-24. It goes east as a four-lane divided highway called Sam Ridley Parkway, a major thoroughfare featuring numerous strip malls, apartments, a high school, and a hospital. It has an interchange with US 41/US 70S/SR 1 on the southern edge of Smyrna Airport. SR 266 then becomes undivided and continues east to an intersection with SR 102, where Sam Ridley Parkway officially end and SR 266 continues east as Jefferson Pike. The highway then narrows to 2-lanes and crosses a bridge over the Stones River just south of Percy Priest Lake, where it leaves Smyrna. SR 266 then passes through rural areas to come to have an interchange with I-840 before passing through Walterhill and having an intersection with US 231/SR 10. SR 266 then continues east through farmland to pass through Lascassas, where it has a short concurrency with SR 96 before turning northward and crossing into Wilson County.
Wilson County
SR 266 winds its way northward through farmland as Cainsville Road, where it passes through Norene and has an intersection with SR 265. The highway then enters Lebanon and passes through an industrial area and has an intersection with Maddox-Simpson Parkway before crossing an overpass over I-40. SR 266 continues north through industrial areas before entering downtown at an intersection with Tennessee Boulevard, where it becomes S College Street. It goes north to have an intersection with US 70 Bus./SR 24, where it becomes N College Street, before coming to an end at an intersection with US 70/SR 26 in a business district. The Tennessee General Assembly, along with State RepresentativeMike Sparks and Senator Bill Ketron honored former Rutherford County HistorianErnie Johns by naming a section of Jefferson Pike, "Ernie Johns Honorary Highway." The Jefferson Pike section of highway from Sam Ridley Parkway to I-840 is in the process of being widened to a four lane highway.
History
For most of its length through Smyrna, Route 266 is a four-lane highway called Sam Ridley Parkway, named for the mayor of the city from 1947 to 1987. Once an undeveloped highway forming part of a beltway around Smyrna and serving the Smyrna Airport, Sam Ridley Parkway now features numerous Strip Malls, Apartments, and even a Hospital.