Texas State Highway 310
|South Central Expressway
S.M. Wright Freeway
|Maintained by TxDOT|
|Length:||6.814 mi (10.966 km)|
|Existed:||1987 – present|
|South end:||I-45 in Hutchins|
|I-20 in Hutchins|
|North end:||US 175 in Dallas|
State Highway 310 (SH 310) is a short north–south state highway entirely within Dallas, Texas. It is a portion of the old route of U.S. Highway 75 along the South Central Expressway, which now ends in downtown Dallas, in the southeastern part of Dallas that Interstate 45 and U.S. Highway 175 did not wholly supplant altogether.
Its northern terminus is US 175; its southern terminus is Interstate 45. The northern section is a freeway to Overton Road, just south of the Trinity River bridge, and a surface street from there to its southern terminus. The southbound bridge is the original simple steel girder bridge from abutment to abutment while the northbound is newer and largely precast concrete - the only steel girders are the longer spans directly over the river. The southbound bridge was repainted by CEKRA for TxDOT in late 2015.
SH 310 north of Loop 12 (along with the northern portion of US 175 with which it connects) was co-named the S.M. Wright Freeway after a local minister. It is technically also referred to as Central Expressway, as the original US 75 was given this name. In practice, Dallasites refer to the current US 75 (the portion north of downtown) as Central Expressway and the decommissioned US 75 (the portion south of downtown) as the S.M. Wright Freeway.
Through southern Dallas, Interstate 45 (also named the Julius Schepps Freeway) has replaced State Highway 310 as a through route. However, as I-45 is completely elevated between downtown and the Trinity River, during freezing rain events it is virtually impassable, whereupon it is closed and traffic is diverted onto State Highway 310.
The entire route is in Dallas County.
|Hutchins||0.0||0.0||I-45 south / Chapman Street south||Southern terminus, interchange, exit 275 on I-45|
|0.5||0.80||I-20 east||Interchange, exit 474 on I-20|
|Dallas||2.2||3.5||Simpson Stuart Road||At-grade intersection|
|4.3||6.9||Illinois Avenue||At-grade intersection|
|5.2||8.4||Overton Road||At-grade intersection, south end of freeway|
|5.9||9.5||Lamar Street||Northbound exit and southbound entrance|
|6.4||10.3||Municipal Avenue / Lamar Street / Haven Street|
|6.6||10.6||US 175 east – Kaufman||Southbound exit and northbound entrance|
|6.8||10.9||US 175 west – Dallas||Northern terminus|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi