Chapter 21: Texas Highway Freight Network, Texas Trunk System, National Highway System, STRAHNET and Hurricane Evacuation Routes
21.1 Overview
This chapter discusses the different networks of highways within Texas that serve specific purposes and may require additional design considerations or higher standards. The following sections provide a general overview of each network as well as a historical summary. All of the networks discussed below can be seen on the
. The chapter includes the following sections and subsections:
21.1 Overview
21.2 Texas Highway Freight Network (THFN)
- 21.2.1 Vertical Clearance at Structures;
- 21.2.2 Signs, Overhead Sign Bridges (OSB’s), Signals;
- 21.2.3 Other Overhead Utilities; and
- 21.2.4 Bicycle and Pedestrian Accommodations.
21.3 Texas Trunk System (TRUNK)
21.4 National Highway System (NHS)
- 21.4.1 History of the National Highway System
21.5 Strategic Highway Network (STRANET)
21.6 Hurricane Evacuation Routes
- 21.6.1 Hurricane Evacuation Lanes; and
- 21.6.2 Contraflow Lanes.