1.2.4 Texas Highway Freight Network (THFN) Design Deviations

A Texas Highway Freight Network (THFN)
design deviation
 is required for projects that do not meet specified Bridge Vertical Clearance Requirements; see
Sections 4.8.6
and
21.2
for applicable project criteria, and Table 4-13 for vertical clearance values.
The Deviation request is exclusive of (and if applicable in addition to) the design exception that may be needed for vertical clearances not meeting the specified requirements in
Sections 4.8.6
. of the respective roadway facility.
The THFN Deviation requests must be submitted to the Design Division (DES) – Project Delivery Section and will be reviewed by an assigned Design Deviation Committee.
A THFN Design Deviation form, process flowchart, and other information can be found on the Design Division’s website.