Eh. Remember to put the end quote command after the segment you want to quote.
I was confining my statement about congestion to freeways. Of course 281 north of 1604 is congested! IT ISN'T A FREEWAY. Not only that, but on the northbound side you have 3 main lanes of traffic and 3 lanes of access condensing to just 3 lanes in about 200 feet then down to 2 lanes about a mile later - all while having to stop at the mercy of the lights.
Comparing the actual freeways between the two cities ends up with Austin having much more congestion. San Antonio is rated fifth for freeway lane miles per capita in the U.S. among urban areas of greater than 1 mil (of course this metric leaves Austin out, but that doesn't matter) at
.867.
And that was data from 1999! The major expansions on 410 had yet come to pass and the expansions on 10 weren't yet finished. 410 still hasn't been finished so you can expect that number to keep rising (either keeping pace with population growth or - the more likely scenario - outpacing that growth). When they finally get to expanding 35 - currently going through prep work in some places - expect that number to jump.
The figures for Austin as most assuredly lower even on a per capita basis, and it doesn't help that toll roads do not typically matter in such metrics as they only count as freeway equivalent lanes in studies like these.
Austin is the largest city in the nation with a single interstate (by no fault of its own - a victim of location and prior small population size), but it has not done itself any favors by continuing to punt expansions down the road in favor of massive lake front beautification projects, needless access roads, 5 stack interchanges in all the wrong places, and overall bad design of infrastructure.