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San Antonio Area Roads & Freeways
Frequently Asked Questions

This page last updated March 18, 2018

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Below are some of the most common questions or complaints I get about San Antonio roads and freeways.


Specific projects
The following projects have FAQ sections on their own pages:

Road construction generally

TransGuide

HOV lanes

Loop 1604

Other
  • Why don't they plan and build new roads before new developments are built?
    That is a lot easier said than done. The city, county, and/or state doesn't know for sure what's coming until a developer submits their plans. But while they might be able to accurately estimate the impact in the immediate area, they really have no way of knowing what the impacts will be to roads further away. For example, how many people from the new development will head north on the nearest freeway vs. those that will head south? There's no way to know until that traffic materializes. Even if they had a crystal ball, it still takes several years before road projects can come to fruition. First there's the design and engineering, then environmental clearances, then waiting for funding, then right-of-way acquisition and utility work. All of that has to happen before the actual project to build or widen a road can start. In the meantime, they can't legally stop the developer from continuing with their project. That said, developers are usually required to conduct traffic impact studies and make local improvements (turn lanes, signals, etc.)

  • So why not, then, build or widen roads ahead of the development?
    A good idea, except that with all of the existing needs that struggle to get funded, there's certainly no money to build new roads out in the middle of nowhere based on hypotheticals. And if they did and the growth didn't come for some reason, it would be a lot of wasted money. For example, the Poteet-Jourdanton Freeway on the South Side was 
    overbuilt when it was initially constructed back in the '50s because it was believed that San Antonio would grow south. It didn't, and,as a result, it's much more road than is needed for the level of traffic it carries even today.

  • What was the first freeway built in San Antonio?
    The section of the lower level of I-10 (then just US 87) between Woodlawn and Culebra. It quietly opened in July 1949. (See the San Antonio Freeways History page for a complete history of the freeway system.)

  • What's the deal with SH 211? It's a road to nowhere and a waste of money.
    The first section of SH 211 opened in 1990 to provide access to the now-defunct Texas Research Park. Because of its location, TxDOT planners knew that it would make an ideal location for a far west Bexar County beltline, an idea that had been around for decades. Like many projects, construction on SH 211 was split into several segments due to funding constraints. Unfortunately, due to issues with right-of-way acquisition, the missing middle segment has languished unfunded for years. However, in 2009, Bexar County agreed to build the missing segment and get reimbursed by the state over several years. See the SH 211 page for additional information.

  • Why doesn't TxDOT upgrade Bandera Rd. through Leon Valley?
    Since the late '80s, various upgrades to Bandera in that area have been proposed, including adding flyovers at major intersections and an elevated tollway, but the City of Leon Valley vetoed all of the plans on the belief that such upgrades would hurt local businesses by speeding traffic through the city (a serious fallacy in my opinion; congestion hurts businesses more than improved access would.) Fortunately, fresh leadership in recent years has resulted in a change to Leon Valley's official position and will hopefully result in much-needed improvements. See the Bandera Road proposals page for more details on current planning for that corridor.

  • Why aren't traffic signals in San Antonio synchronized?
    Actually, most of them are. See the City of San Antonio's traffic signal management page for details. That said, if you're on a road and it doesn't seem like the signals are synchronized, here are some possible reasons why:
    • You're traveling faster than the speed limit. Signals are synchronized for to allow a group of cars (a "platoon") moving at the speed limit of the roadway. If you're speeding and get out ahead of the platoon, you'll hit the next signal when it's still red.
    • You're traveling significantly slower than the speed limit (either because you're lollygagging or due to traffic.) If you fall behind the platoon, you'll hit the next signal as it turns yellow or red.
    • The road you're on intersects with another road where signals are synchronized. If the synchronization on one roadway conflicts with that on the other, then one will take priority over the other.
    • You're headed on the opposite direction of the timing. Sometimes, signals on a roadway are only timed for traffic headed in one direction (i.e. the direction with the heaviest flow of traffic.)
  • If I'm at a red light and nobody is coming on the intersecting road, why doesn't the light turn green for me right away?
    There are several reasons why this can happen:
    • If the intersecting road has synchronized traffic signals, then your signal will have to wait for scheduled gaps in that "green wave" before it can change. When signals are synchronized, the green times on that road are fixed and can't be preempted (except for emergency vehicles.)
    • The minimum green time on the intersecting roadway hasn't yet expired. Whenever a signal turns green, there is a set minimum amount of time it must stay green. This minimum length can be extended if there is a pedestrian crossing.




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This page and all its contents are Copyright 2018 by Brian Purcell

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