SH 3 is sometimes referred to as Old Galveston Road, indicating its function as a thoroughfare between Houston and Galveston.

Spur routes

Numerous spur routes were created along the main routing of SH 3, especially during the 1920s:

50pxState Highway 3-A was a state highway proposed on July 9, 1917, splitting from the main route at Houston and roughly parallelling it to the north through La Grange and ending at San Marcos. On October 8, 1917, the routing had changed

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