Interstate 35
I-35 is the county's central north-south highway and connects Hays County with the Austin and San Antonio metropolitan areas. It is particularly important around Buda, Kyle, and San Marcos.
New drivers should practice entering the freeway at an appropriate speed, checking mirrors and blind spots, maintaining lane position, and planning exits early. Frontage-road entrance and exit ramps also require attention because the correct lane may change quickly.
I-35 Frontage Roads
Frontage roads are a major part of the local driving experience. The I-35 at SH 123 project includes reconstruction of both northbound and southbound frontage roads, ramp changes, and extended entrance and exit lanes. TxDOT describes I-35 as the backbone of the local, regional, and national transportation network and reported more than 155,000 vehicles per day on the project segment.
For a beginning driver, frontage-road driving requires careful attention to turn lanes, ramp locations, traffic entering from adjacent roads, and the difference between an entrance ramp and an exit ramp.
SH 123
SH 123 runs through San Marcos and continues south toward Seguin. Within San Marcos, it connects different parts of the city while also serving regional travel. Local transportation planning identifies sections with speeds ranging from lower-speed urban areas to higher-speed portions outside the central area.
SH 80
SH 80 serves San Marcos and connects the I-35 area with eastern parts of the city and routes toward Luling. It is another example of a road where a driver can move from a more urban environment into higher-speed regional travel.
SH 21
SH 21 crosses the eastern portion of the county and continues toward Bastrop County. New drivers should be prepared for longer stretches of higher-speed roadway outside the denser parts of San Marcos and Kyle.
RM 12 and FM 2439
RM 12 and FM 2439 are important Hill Country corridors around San Marcos and Wimberley. TxDOT has studied and planned improvements along portions of these roads, including pedestrian, bicycle, intersection, and roadway improvements.
RM 150, RM 1826 and US 290
The western side of Hays County connects with the Dripping Springs area and the US 290 corridor. TxDOT is studying and planning improvements involving US 290, RM 12, RM 150, and RM 1826 as transportation demand changes in the Hill Country area.
FM 1626 and RM 967
These roads are important around the Buda and Kyle portions of the county and provide connections between residential areas, I-35, and other regional roads. TxDOT project documents identify FM 1626, RM 967, and nearby I-35 frontage roads among the transportation facilities in Hays County.