San Antonio radiates out from downtown in rings. Loop 410 circles the inner city, and Loop 1604 makes a much wider ring through the northern suburbs and out toward the bases and the edges of Bexar County. I-10 runs northwest toward Boerne and the Hill Country and east toward Houston, I-35 runs northeast to New Braunfels and Austin and southwest toward Laredo, and I-37 heads south to Corpus Christi. US 281 carries the commute north to Stone Oak, US 90 runs west past the Lackland area, and Wurzbach Parkway cuts east-west across the north side.
The north side is where traffic bites hardest. The US 281 and Loop 1604 interchange, the I-10 corridor past the Medical Center and UTSA, and I-35 toward Schertz back up most weekdays, and the frontage roads alongside them carry as much local traffic as the main lanes. For a mobile mechanic, those frontage roads and the big parking lots beside them are useful places to reach a disabled car safely. The older neighborhoods inside 410 sit on a looser street grid where curbside work is easy.
San Antonio International Airport sits inside Loop 410 just off US 281, close enough to the north-central neighborhoods that a car stuck in its lots is a short trip. VIA Metropolitan Transit runs the city's buses. Joint Base San Antonio, which includes Fort Sam Houston, Lackland and Randolph, brings steady military traffic to the east, west and northeast sides, and the South Texas Medical Center anchors the northwest.