I-85 begins at a six-ramp modified
directional T interchange with I-65 southwest of downtown Montgomery. In addition to the ramps to and from I-65, the terminating Interstate's dual carriageways continue west a short distance and become Day Street; the interchange also includes a ramp from southbound I-65 to Day Street and from Day Street to northbound I-65. I-85 heads east toward downtown Montgomery as an eight-lane freeway. The highway has a pair of half
diamond interchanges with Court Street (northbound exit, southbound entrance) and Union Street (southbound exit, northbound entrance). The
one-way pair of Arba Street and South Street serve as frontage roads for the northbound and southbound lanes, respectively, along the southern edge of downtown. The interchanges provide access to the
Alabama State Capitol and
Alabama State University. Southeast of downtown Montgomery, I-85 has a pair of half interchanges with Forest Avenue (northbound exit, southbound entrance) and Mulberry Street (southbound exit, northbound entrance). I-85 leaves the core of Montgomery and has a diamond interchange with Ann Street and a six-ramp
partial cloverleaf interchange with Perry Hill Road. The freeway's next junction is with East Boulevard, which forms part of a circumferential highway around Montgomery; the partial cloverleaf interchange includes a flyover ramp from northbound East Boulevard to southbound I-85. East Boulevard carries
US Route 231 (US 231) and
State Route 21 (SR 21) through the interchange and
US 80 south from the interchange; US 80 joins I-85 heading east from Montgomery. I-85's interchange with
SR 271 provides access to
Auburn University at Montgomery. The Interstate drops to four lanes between SR 271 and the next interchange with
SR 110 and
SR 126 (Atlanta Highway), where the route leaves the city of Montgomery. I-85 and US 80 parallel SR 126 east through the community of
Mount Meigs and through an unused directional T interchange with SR 108, which is also future I-85. This is among the largest and tallest interchanges in the state, featuring SR 126 and SR 293 on both sides of the Interstate and freeway state route. US 80 splits east onto Atlanta Highway at a diamond interchange, and I-85 heads east-northeast, leaving
Montgomery County and entering
Macon County at Line Creek. Another access to US 80 is provided at
Shorter via an interchange with unsigned
SR 138. The Interstate meets the southern end of
SR 229 south of SR 229's crossing of the
Tallapoosa River and the southern end of
SR 49 near the town of
Franklin. I-85's interchange with
SR 81 connects the freeway with the Macon County seat of Tuskegee and
Tuskegee University. The Interstate's final access to US 80 is via
SR 186 (Wire Road), beyond which the freeway passes through a portion of the
Tuskegee National Forest. I-85 continues northeast into
Lee County. On the southern edge of Auburn, the freeway has an interchange with Auburn Technology Parkway.
US 29 joins I-85 at its next interchange with College Street;
SR 147 continues north along College Street toward
Auburn University. I-85 and US 29 continue northeast through the city to an interchange with Bent Creek Road, which provides access to
Auburn University Regional Airport. The freeway continues northeast into the city of Opelika, the county seat of Lee County. I-85 gains a second US Route
concurrency at its four-ramp partial cloverleaf interchange with Gateway Drive, where
US 280 joins from the north. The three highways cross over a
Norfolk Southern Railway line just west of their four-ramp partial cloverleaf interchange with
SR 51 and
SR 169 south of downtown Opelika. US 280 splits east toward Phenix City and Columbus at the next interchange with
US 431. US 29 diverges from I-85 at the following interchange, and the Interstate leaves the city of Opelika beyond its junction with Andrews Road. The Interstate enters
Chambers County at its interchange with County Road 388 (CR 388), which leads to
Cusseta. I-85 meets CR 208 in the unincorporated area of
Huguley west of the city of
Valley. Southbound I-85 has a
welcome center between CR 208 and the freeway's final interchange in Alabama, a junction with US 29 between the cities of Valley to the south and
Lanett to the north. I-85 crosses the
Chattahoochee River on its way toward
LaGrange and Atlanta. ==History==