State Highway 66 (SH 66) is a state highway located in the northeastern region of Texas. It runs approximately 30 miles, connecting the cities of Garland and Greenville. The highway serves as an important route for local traffic and provides access to various communities along its path. Established in the early 20th century, SH 66 has undergone several improvements and realignments over the years. It features a mix of urban and rural landscapes, with sections that include residential areas, commercial zones, and agricultural land. The highway plays a vital role in facilitating transportation and commerce in the region.