Speed Limits - 75 and 80 Mile Per Hour
As of September 2011, state law allows TxDOT to create higher speed limit on any state highway if found to be reasonable and safe through an engineering study. Each new 75 or 80 mph speed limit must be approved by the Texas Transportation Commission.
The tables below show approved 75 and 80 mph zones and are divided by the month in which the Commission approved the speed limit increase.
March 2012 - 80 mph
| Highway | Location | Previous Speed |
Miles | Map |
| SH 130 | From IH 35 in Williamson County to US 183 in Travis County | 75 | 45 |  |
| SH 45 S | From US 183 to IH 35 in Travis County | 75 | 9.2 | |
January 2012 - 75 mph
| Highway | Location | Previous Speed |
Miles | Map |
| IH 10 | From the New Mexico State Line to Mile Marker 8 in El Paso | 70 | 9 | |
| IH 10 | From Mile Marker 36 South of El Paso to the El Paso – Hudspeth County Line | 70 | 26 | |
| IH 10 | From the Kerr – Gillespie County Line to Loop 1604 in San Antonio | 70 | 63 | |
| IH 10 | From Mile Marker 582 in San Antonio to the Austin – Waller County Line | 70 | 145 | |
| IH 10 | From the Chambers – Jefferson County Line to US 69 in Beaumont | 70 | 19 | |
| IH 10 | From the Jefferson – Orange County Line to the Louisiana State Line | 70 | 25 | |
| IH 20 | From the Ward – Crane County Line to the Palo Pinto – Parker County Line | 70 | 310 | |
| IH 20 | From the Kaufman - Van Zandt County Line to the Louisiana State Line | 70 | 122 | |
| IH 27 | From Mile Marker 8 North of Lubbock to Mile Marker 117 in Amarillo | 70 | 109 | |
| IH 30 | From the Rockwall – Hunt County Line to FM 989 in Texarkana | 70 | 139 | |
| IH 35 | From Mile Marker 7 in Laredo to the Webb – La Salle County Line | 70 | 31 | |
| IH 35 | From the Frio – Medina County Line to SS 442 in San Antonio | 70 | 31 | |
| IH 35W | From the IH 35 Split North of Hillsboro to the Hill – Johnson County Line | 70 | 14 | |
| IH 35E | From the IH 35 Split North of Hillsboro to the Hill – Ellis County Line | 70 | 8 | |
| IH 35 | From the Denton – Cooke County Line to the Oklahoma State Line | 70 | 22 | |
| IH 37 | From Mile Marker 4 in Corpus Christi to Mile Marker 134 in San Antonio | 70 | 130 | |
| IH 40 | From the New Mexico State Line to Mile Marker 64 in Amarillo | 70 | 65 | |
| IH 40 | From Mile Marker 75 in Amarillo to the Oklahoma State Line | 70 | 101 | |
| IH 44 | From Mile Marker 4 in Wichita Falls to the Oklahoma State Line | 70 | 11 | |
| IH 45 | From the Montgomery – Walker County Line to the Navarro – Ellis County Line | 70 | 143 | |
October 2011 - 75 mph
| Highway | Location | Previous Speed |
Miles | Map |
| SH 45 N | From US 183 in Travis County to SH 130 in Williamson County | 70 | 13.5 |
|
September 2011 - 75 mph
| Highway | Location | Previous Speed |
Miles | Map |
| IH 35 | From Georgetown in Williamson County to Salado in Bell County | 70 and 65 | 21.7 | |
| SH 130 | From IH 35 in Williamson County to US 183 in Travis County | 70 | 45 | |
| SH 45 S | From US 183 to IH 35 in Travis County | 70 | 9.2 | |
| US 281 | From the Lampasas-Burnet County Line to 8 miles north of the Burnet City Limit | 70 | 11.9 | |
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