Road naming
Interstates = I-XX
US Highway = US-XX
State Highway = SH-XX
Farm/Ranch to Market = FM XX
County Road = CR-XX
Interstates throughout the state
- I-2 Rio Grande Valley
- I-10 New Mexico to Louisiana
- I-20 Midland/Odessa to Louisiana
- I-27 Lubbock to Amarillo
- I-30 Fort Worth to Arkansas
- I-35 Mexico to Oklahoma
- I-35E Hillsboro to Denton through Dallas
- I-35W Hillsboro to Denton through Fort Worth
- I-37 Corpus Christi to San Antonio
- I-40 New Mexico to Oklahoma
- I-45 Galveston to Dallas
- I-69 Brownsville/Edinburg/Laredo to Texarkana (will follow US-59)
- I-369 Spur to west side of Texarkana
- I-410 Loop around San Antonio
- I-610 Loop around Houston
- I-635 Spur through DFW Metroplex
- I-820 Loop around Fort Worth
Functional classification
Texas is participating in the new Functional Classification in a limited capacity. Cities/areas with a population greater than 250,000 will be turned over to functional class. At this time, rural towns and rural Texas are to be left alone. See Texas/FC for details