Bridges, culverts, walls, tunnels, and other structures must be designed in accordance with the current . The design loading must be HL-93 design live load unless design for a special vehicle is specified or warranted.

Structures that carry ramps must provide a clear width equal to the ramp width, including the ramp shoulders. The structure width and lateral clearance of highways and streets overpassing or underpassing the freeway are dependent on the functional class of the highway and street being underpassed or overpassed as discussed in , , and .

Refer to the latest and for additional guidance on structures on TxDOT facilities.