16.2.1 TIA Categories

Confirm TIA categories with the local TxDOT District. If the District does not have guidelines for TIA categories, it is recommended to use Texas Transportation Institute’s (TTI’s) Recommended Access Management Guidelines for Texas (Report No. FHWA/TX05/0-4141-2). A TIA is classified into one of three typical categories based on the number of trips generated by the development as shown in . Developments that generate less than 100 trips and prompt minor engineering studies for access management purposes are also recommended to confirm that proposed driveways comply with TxDOT’s Access Management Manual. An
example
 of determining peak hour trip generation is provided in
Appendix Q, Section 3 – TIA Example Problems
.
Table 16-1: TIA Categories
Categories
Peak Hour Trip Generation Range (veh/hr)
Additional Requirement
Analysis to Include
1
100-499
The TxDOT District can request a TIA if under 100 trips result from localized safety or capacity deficiencies.
  • Buildout year of development
  • Ramps, roads, and intersections that are significantly impacted by development
  • Site access drives and intersections adjacent to site
2
500-1,000
NA
  • Buildout year of development
  • Year of completion of each phase
  • Five years after full buildout
  • Ramps, roads, and intersections that are significantly impacted by development
  • Site access drives and intersections within 1 mile of the development
3
>1,000
NA
  • Year of completion of each phase
  • Year of completion
  • Five years after full buildout
  • Ten years after full buildout
  • Ramps, roads, and intersections that are significantly impacted by development
  • Site access drives and intersections within 1 mile of the development
Note: Service drives, emergency drives, and other drives with minimal traffic are typically omitted. This table is adapted from TTI’s Guidelines.