SH 310 begins at I-45 and ends at US 175. It begins at I-45 in Hutchins as an arterial road named the South Central Expressway and intersects I-20 before entering Dallas. Passing through South Dallas, SH 310 has an interchange with Loop 12, taking on the name of the S. M. Wright Freeway. At the intersection with Overton Road, SH 310 becomes an expressway and promptly crosses the
Trinity River. Continuing on, SH 310 ends at interchange with US 175. Previously, after intersecting a couple side roads just south of Elsie Faye Heggins Street, SH 310 became a full fledged freeway, having an interchange with the aforementioned arterial. Continuing on, SH 310 had interchanges at Pine Street, Metropolitan Avenue, Pennsylvania Avenue, and Martin Luther King Jr. Boulevard before it ended at an interchange with I-45, Cesar Chavez Boulevard, and the Good-Latimer Expressway near downtown Dallas. SH 310 north of Loop 12 was co-named the S.M. Wright Freeway in 1995 by Governor
George W. Bush after the Reverend S.M. Wright (1927-1994). Wright was a local pastor and civil rights leader from South Dallas. It is still technically also referred to as the Central Expressway, as it is a former portion of that road. 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. The southbound Trinity River 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. Through southern Dallas, I-45 (also named the Julius Schepps Freeway) has replaced SH 310 as the 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 SH 310. ==History==