12.2.1 Overview

This section provides design guidance for projects meeting all the following conditions:
  • Included in the off-system bridge replacement and rehabilitation program;
  • Facility not likely to be added to the designated State Highway System; and
  • Current ADT of 400 or less.
If all the above conditions are not met, then the design criteria for the appropriate functional class of highway should be utilized. For off-system bridge projects, current ADT may be used with the appropriate functional class of highway (i.e., enter tables, charts, or figures with current ADT substituted for future ADT).
Where significant traffic growth is expected, or the roadway will be widened in the near future, the use of future ADT and corresponding design criteria for design purposes is encouraged.
For more information on the off-system bridge replacement and rehabilitation program, refer to TxDOT’s
Bridge Project Development Manual
.
Additional vertical clearance requirements may apply to bridge projects on the Texas Highway Freight Network (THFN) as specified in
Chapter 4
.