This page last updated February 19, 2024
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Here is a brief "PowerPoint" summary of this project:
- This project will convert the intersections along Bandera Rd. to "Restricted Crossing U‑turn" (RCUT) intersections from Legend Trail to Diamond K Trail.
- This will modify the intersections at Hausman/Leslie and Cedar Trail to force traffic on those cross streets to turn right, i.e. left turns and straight-through movements from those cross streets will be blocked, but left turns from Bandera Rd. to those cross streets will still be allowed.
- Downstream turnarounds will then allow traffic from the cross street to make a U‑turn to return to their intended direction of travel. (See diagrams below.)
- This is the same configuration as at Bandera Rd. and FM 1560 South.
- Doing this reduces the number of traffic signal phases required to move traffic through the intersections, thereby allowing for longer green times for all movements without extending the overall cycle time. This allows for more traffic to move through the intersection in the same amount of time, thus reducing wait times and congestion. (See explanation below.)
- While it seems confusing at first, it's actually pretty easy to navigate.
- Studies of past RCUTs show improved safety as well as reduced congestion.
- A new left turn (signalized) will be built from northbound Bandera Rd. to Legend Trail.
- The crossover at Diamond K Trail will be closed.
- Bandera Rd. will be widened to three lanes each direction between Hausman/Leslie and Circle A Trail.
- Based on community feedback, TxDOT directed their consultant to study possible changes at Circle A Trail, but that study determined that the changes desired by local residents would result in increased crashes and congestion due to the disruption that would be introduced by the signal timings required to facilitate left turns from Circle A Trail to SB Bandera Rd. (See further explanation below.)
This project will convert the intersections on Bandera Rd. at Hausman Rd./Leslie Rd. and Cedar Trail to "Restricted Crossing U‑turn" (RCUT) intersections, add signalized turnarounds at multiple intermediate locations, and close the crossover at Diamond K Trail. It will also construct a new signalized left turn from northbound Bandera Rd. to Legend Trail, expand the southbound Bandera left turn to Hausman to two lanes, and will widen Bandera to three lanes in each direction between Hausman/Leslie and Circle A Trail.
The RCUT intersections will prevent traffic on Leslie/Hausman and Cedar Trail from going straight or turning left. Instead, all traffic will make a right turn, then use a signalized turnaround about 1,000 feet downstream to make a U‑turn and continue in the intended direction of travel. Left turns from Bandera Rd. to those cross streets will still be allowed. To better visualize this, click on the following diagram.
This project will also build an underground storm drainage system and sidewalks throughout.
The intersection at FM 1560 South was converted to an RCUT configuration in 2018, and the intersection at Loop 1604 was converted to a displaced left turn (DLT) in 2019, so this will close the gap between these two improved intersections and complete the master plan for this section of Bandera Rd. TxDOT plans to eventually continue the RCUT configuration all the way to Triana Pkwy. as traffic warrants.
An RCUT intersection is also known as a "superstreet".
Based on resident feedback as part of the planning for the this project, TxDOT asked their engineering consultant to re-evaluate the Circle A Trail intersection to determine if it would be feasible to allow left turns from Circle A to southbound Bandera. While still physically possible, the analysis showed that doing so would be problematic from an overall operational standpoint. With the RCUT intersections, the signals in each direction of the corridor operate independently and therefore can be better timed for the respective traffic volumes, thus resulting in better overall traffic flow and fewer delays for all directions of travel. Converting the Circle A intersection to allow left turns would require the signals for northbound and southbound Bandera at that location to return to interdependent operation, thus complicating the coordination of the signals in one or both directions of the remainder of the corridor. This would nullify the benefits of the RCUTs and result in this intersection becoming a new bottleneck, the significance of which would increase over time as traffic in the corridor increases.
There were also safety issues with reintroducing left turn cross traffic conflicts at one location in a corridor that otherwise will not have any. The negative impacts to the overall corridor operation and safety were significant enough to outweigh the benefits for the relatively small volume of traffic from Circle A Trail.
It's worth noting that reducing congestion along Bandera benefits the residents of Helotes Park Estates and should reduce their overall travel time in the corridor even with the additional travel time required to execute the right-turn and U‑turn, and that there are many other locations where drivers are required to go a little out of their way for the benefit of overall efficiency and safety, including some long-time existing locations nearby along Bandera Rd.
How this project will help
The Bandera Rd. - Hausman Rd./Leslie Rd. intersection experiences significant to severe recurring congestion during both the morning and evening rush hours and is the main choke point on Bandera outside Loop 1604. Converting the intersection to an RCUT will increase the throughput of the intersection significantly and reduce wait times and delays correspondingly in this section of the corridor.
If all of that sounds like technical gibberish, here's another way of explaining it:
At the conventional intersection, drivers who arrive as the light turns red have to wait for three or four other directions to get a green light before their light turns green again. At an RCUT intersection, drivers only have to wait for one signal change before they get a green again. Drivers then needing to use the turnaround may have to subsequently wait for one more signal change, but that's still less than before.
Additionally, with an RCUT, each half of the intersection operates independently of the other, so the signals along each direction of Bandera Rd. can be timed separately from the other direction, which means better coordination and synchronization are possible.
Modeling showed that this configuration is expected to provide good long-term congestion relief based on 20-year traffic projections.
|Example Bandera Rd. - Hausman Rd./Leslie Rd. Signal Timings
represents Bandera Rd. traffic
The other arrows represent the other intersection movements relative to Bandera Rd.
For a deeper dive on how an RCUT functions and how it improves traffic flow, see the main Restricted Crossing U‑turn intersections page.
- This looks confusing. It will cause lots of crashes.
This is always one of the first visceral assertions made when an unconventional intersection is introduced. With any change — even more conventional changes such as new signals or lanes — it naturally takes drivers a little time to adapt. With an RCUT, because all traffic on the intersecting street is forced to turn right, most confusion is quickly overcome instinctively once the driver has turned or as the driver follows other more experienced drivers through the intersection. Additionally, because all traffic is flowing in the same direction and is protected by signals, the likelihood of collisions is substantially reduced, even during the adjustment period. RCUTs also inherently improve safety by reducing conflict points (the point where vehicle paths cross) by half.
Statistics for RCUTs show improved safety. A study for the North Carolina DOT showed that RCUTs reduced traffic collisions by 46% and decreased injury crashes by 63%. A study of RCUT intersections in Missouri showed a 54% reduction in injury and fatal crashes. Many people predicted mayhem at the Bandera/1604 displaced left turn intersection, but, despite higher traffic volumes in 2021, the number of crashes was less than half of the number in 2017.
- How does this crazy design improve traffic? How does adding even more traffic signals help?
This intersection design improves traffic because, by forcing all traffic on the cross street to turn right, the green time for that can be overlapped with the green time for traffic turning left from Bandera onto the cross street. This essentially eliminates the green time that would be needed for the through and left turn movements on the cross street, so that time can then be reallocated to the remaining movements, thus moving more traffic through the intersection in the same amount of time. Although there are extra signals, they are all much more efficient and are better coordinated. See the "How an RCUT works" section of the Restricted Crossing U‑turn intersections page for a deeper explanation of the RCUT "secret sauce."
- All they have to do is adjust the signal timing and that will solve the problem.
It's a common belief that congestion can be solved by simply adjusting the signal timing. In some specific cases, that can be true, but at very busy intersections like Hausman and Bandera where there has to be sufficient green time for eight different movements on every cycle, the signals can only be optimized so much before the laws of physics win. For example, the green time on Hausman could be extended to help clear out the peak period backups that occur there, but that means the light will stay red longer for Bandera, which then increases the wait times and backups there. If the green time on Bandera is then increased to ease those backups, that means the light will stay red longer for Hausman and you're right back where you started. So as you can see, it's really not as easy as it sounds.
- This causes people to have to go out of their way, which is inconvenient and will require more time to get across Bandera Rd.
Some folks understandably are peeved that to turn left or go straight on the cross street requires going out of one's way to accomplish, and think that doing so will increase travel time. While the former is true and will always be perceived as an inconvenience by some drivers, wait times in general should be shorter and overall congestion in the area reduced. As a result, travel time through the intersection for those specific movements should typically be no longer than it would be at a conventional intersection even with the added time necessary to use the turnaround. Also, keep in mind that there are many other examples where traffic wanting to make a left turn is prohibited from doing so due to a median, freeway, or one-way street and must therefore turn right first, then make a downstream U‑turn or series of left turns, so this situation is not unprecedented or unique to RCUTs. In fact, this has already been the case along much of this section of Bandera Rd. due to the existing median — for example, when leaving any of the businesses along Bandera between Hausman/Leslie and Cedar Trail.
- This will benefit traffic on Bandera more than that on Hausman, Leslie, or Cedar Trail.
That's probably a fair assessment. Bandera Rd., after all, carries substantially more traffic than those other roads. But traffic on Hausman and Leslie will still benefit. Those making a right turn onto Bandera will see the most benefit, but even those turning left onto Bandera or crossing Bandera should still see some modest benefits due to overall reduction of wait times and congestion at the intersection and corresponding decreased travel times. Those same people almost certainly also use Bandera Rd. heading in other directions at some other point in their daily lives, so they'll realize those benefits as well.
- This will increase emergency response times in the area.
TxDOT worked with the City of Helotes to mitigate concerns with response times. As a result, some adjustments to the plans were made including an emergency vehicle median crossover at Hausman/Leslie and additional pavement at the northwest corner of that intersection to facilitate a turnaround for emergency vehicles. Again, it's worth noting that most of this stretch of Bandera today does not have intermediate crossovers, and after the aforementioned adjustments, the only crossover being lost for emergency vehicles is at Diamond K Trail, which is being mitigated by ensuring that emergency vehicles will be able to make a U‑turn at Hausman/Leslie.
- Why are there signals to leave the turnarounds?
This is to prevent the significantly slower-moving vehicles making that U‑turn from entering the faster traffic stream and causing conflicts that could result in collisions or congestion. Accordingly, a left turn on red will not be allowed at those signals.
- Will I be able to make a right turn on red?
To turn from Bandera onto Hausman, Leslie, or Cedar Trail, there will be a channelized right-turn lane with a yield sign, so traffic turning right will not be controlled by the signal and will simply have to yield when turning.
On Hausman, Leslie, and Cedar Trail, a right-on-red onto Bandera will only be allowed from the rightmost lane; the other lane(s) will not be allowed to turn right on red. This is for both safety reasons as well as for congestion mitigation.
At Legend Trail, traffic turning from Bandera onto Legend Trail will be allowed to turn right on red, but traffic turning onto Bandera from Legend Trail will not be allowed to do so.
- If I'm headed south on FM 1560 (Hausman Rd.) and want to go to Wal-Mart, Starbucks, Bill Miller's, Kuentz ES, or O'Connor HS, or to head southbound on Bandera Rd., how do I get there?
At Bandera Rd., you'll turn right, travel about 1,000 feet to a turnaround (just past Little Caesar's Pizza), then head southbound on Bandera where you can turn right at Bill Miller's, Leslie Rd. (for the schools), Starbucks, or Wal-Mart, or continue straight on southbound Bandera. To return to Hausman Rd. from Bill Miller's, Kuentz, O'Connor, Starbucks, or Wal-Mart, you'll turn right onto Bandera Rd. and use a turnaround just past Wal-Mart to return to Hausman Rd., which, in several of those scenarios, is actually more convenient than what's there today.
- Why not build overpasses instead?
Across the country, traffic engineers have discovered that innovative intersections like this can produce good congestion relief and safety at a fraction of the cost, disruption, construction time, and aesthetic impact of flyovers and other traditional grade-separated solutions. This allows limited transportation dollars to be saved and used for other needed projects.
The current and future traffic volumes and safety considerations along Bandera Rd. aren't sufficient to justify the construction of overpasses or conversion to a freeway, but they are in the "sweet spot" to support RCUTs. Furthermore, the right-of-way along Bandera Rd. is not wide enough for overpasses or a freeway, so the cost would be considerably higher as additional right-of-way would have to be obtained, which likely would result in the displacement of many businesses.
- Will the Circle A Trail intersection be changed to allow left turns again?
No, that intersection is outside the scope of this project, although TxDOT did re-evaluate this intersection when planning this project; see the discussion of this in the "Circle A Trail intersection" section above.
- Are there any other RCUTs in San Antonio?
Yes, there have been two other RCUT segments in San Antonio. One was on US 281 north of Loop 1604 and the other was nearby on Loop 1604 between Braun Rd. and Culebra Rd. Both were built as short-term solutions while approval and funding for freeway expansions was obtained. As intended, the Loop 1604 RCUT was replaced by a freeway in 2016, and the US 281 RCUT was replaced by a freeway in 2021. Unlike the 281 and 1604 RCUTs, which were built as short-term fixes, the RCUTs in Helotes are considered a long-term solution. RCUTs are now also proposed for Bandera Rd. inside Loop 1604 and for Loop 1604 from US 90 to Macdona Lacoste Rd., and have been constructed on a segment of Loop 337 in New Braunfels.
- I heard that the US 281 "superstreet" was removed because it was not working well, so why build one here?
That is false. There had always been plans going back to 2000 to upgrade US 281 in that area to a freeway. However, multiple lawsuits by anti-toll activists and environmentalists, and a resulting requirement to conduct a lengthly environmental study, delayed the project for nearly two decades. In 2009, with congestion reaching severe levels, the "superstreet" (aka RCUT intersections) was proposed as a short-term "band-aid" to help provide some relief, which it did until construction on the freeway was finally able to get started in 2017. The expected future traffic volumes on US 281 exceed what RCUTs can optimally handle, so that would never have been planned as a permanent solution there. However, the current and projected traffic volumes on Bandera Rd. are in the "sweet spot" for RCUTs to have a significant long-term positive impact. For comparison, traffic volumes on the section of US 281 with the RCUTs ranged from 55,000 at Marshall Rd. to 100,000 at Redland Rd., while on Bandera they range from 23,000 just west of FM 1560 South to 43,000 at Loop 1604.
- Who came up with this cockamamie design? This won't work and is just a waste of money.
The RCUT design and variations have been used in several US states for more than 20 years and has a proven track record of improving traffic wherever it has been implemented. Both the US 281 and Loop 1604 RCUTs showed appreciable improvements, and computer modeling shows that these RCUTs will do the same. An RCUT is one of several types of "innovative" or "alternative" intersection designs being implemented across the country at intersections where benefits from conventional intersection improvements would be short-lived but where conditions do not warrant more expensive traditional upgrades such as overpasses. Many people expressed similar skepticism about the nearby Bandera/1604 displaced left turn (DLT) intersection, but the new design has substantially reduced congestion and crashes there.
Click on the image below to open the detailed schematic for this project from TxDOT with my own annotations added to help clarify and explain the various elements. The schematic will open in a new window that you can scroll and zoom.
TxDOT has a good video that describes this project:
Other sites of interest
|TxDOT - Virtual Public Meeting - SH 16 Helotes
|Pape-Dawson "Superstreets in Texas" presentation
|NC Department of Transportation presentation on superstreets
(Excellent explanation of all aspects of superstreets)
|Wikipedia - Superstreet
|Virginia Department of Transportation - Restricted Crossing U‑turn
|Federal Highway Administration - Restricted Crossing U‑turn Intersection Informational Guide
|An Update on Superstreet Implementation and Research