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San Antonio Area Freeway System
PROJECT INFO: I-10 from La Cantera to Ralph Fair

This page last updated February 24, 2017


Project locationLocation: I-10 West from La Cantera Pkwy. to Ralph Fair Rd.

Status: Construction planned

Description: This $70 million project will add one general-purpose mainlane (for a total of three) and one high-occupancy vehicle (HOV) lane in each direction. These lanes will be added in the open median of the current roadway with the HOV lanes in the center between the general-purpose mainlanes (see cross-section below.) No entrance or exit ramps will be changed as a result of this project.

The northbound HOV lane will start just north of La Cantera Pkwy. There will be an intermediate entrance/exit point between Camp Bullis Rd. and Dominion Dr. for traffic to exit for Boerne Stage Rd. and Ralph Fair Rd. The HOV lane will then continue and end just north of Boerne Stage Rd. where it will merge into the left general-purpose mainlane. That left mainlane will then end just north of Ralph Fair Rd.

On the southbound side, the third general-purpose mainlane will be added to the right from a forthcoming entrance ramp located just north of Ralph Fair Rd. The HOV lane will then start on the left just south of Ralph Fair Rd. There will be an intermediate entrance/exit point between Stonewall Pkwy. and Camp Bullis Rd. for traffic wanting to exit to Camp Bullis Rd. and La Cantera Pkwy. The HOV lane will then continue and end just south of Camp Bullis Rd. where it will merge into the left general-purpose mainlane.

How this project will help: This section of I-10 is growing rapidly and experiences recurrent daily congestion. The additional lanes will provide additional capacity. The HOV lanes will be the first in an envisioned system of HOV lanes in San Antonio and are intended to help reduce congestion by encouraging carpooling and mass transit usage.

Timeline: This project is expected to go to construction in late summer of 2017 and be complete in early 2020.


  • Will this project be tolled?
    No. Although an earlier version of this project proposed tolled managed lanes, funding was secured to remove the toll component. Instead, two toll-free mainlanes and two toll-free HOV lanes (one of each per direction) will be added.

  • I will not use the HOV lane, so it won't benefit me. My taxes shouldn't pay for something I won't use.
    Even if you don't use the HOV lane, you will still get the benefit of it in that every vehicle that uses the HOV lane is one or more vehicles that won't be in the general-purpose mainlanes, thus reducing congestion there. We all pay taxes for many things we don't use or directly benefit from but that benefit everyone generally. Don't forget that the people who will use the HOV lanes are also taxpayers.

  • Instead of an HOV lane, another general-purpose mainlane would provide more capacity.
    Yes, having an extra mainlane in place of an HOV lane would provide more
    general-purpose capacity. But the benefit would be short-lived because that extra lane will soon also become congested and will leave less room (if any) then to expand. With an HOV lane, planners build-in a corridor that can be used now and well into the future to move more people per vehicle through the corridor, people who won't be clogging the mainlanes in their single-occupancy cars. Freeway corridors are more than just pathways for vehicles-- they're high-capacity transportation corridors that need to be considered not only for their ability to move vehicles, but also their ability to move people. These two purposes can coexist and HOV lanes are a way of doing that. A new general-purpose mainlane, while providing immediate gratification, is myopic in the long-run; HOV lanes reflect a more sophisticated long-term planning desired by many citizens.

  • Nobody wants HOV lanes.
    That's simply not true. Of the over 3,500 respondents to the recent SA Tomorrow transportation planning survey, 76% either agreed or strongly-agreed that HOV lanes should be an important part of San Antonio's transportation future. Anecdotally, the author of this website attends nearly every public meeting for transportation projects and has consistently heard broad-based citizen support for HOV lanes.

  • Why build an HOV lane here when there aren't any others in San Antonio?
    The inclusion of HOV lanes in freeway projects is a recent change in local transportation planning and this project was in development when that policy was put into effect, so it was included in the project. Consquently, this could be considered a "starter" HOV lane. Another is planned on US 281 North and carpools will likely be allowed in planned managed lanes on Loop 1604. Furthermore, planners are already considering how to continue the I-10 HOV lanes inside 1604. Remember that San Antonio's freeway system started with short section of I-10 between Woodlawn and Culebra that provided no significant connectivity but was part of a bigger plan. "Rome wasn't built in a day."

  • What will be the requirements to use the HOV lanes?
    It is planned that the HOV lane will be open to vehicles with two or more passengers (HOV 2+), transit vehicles, motorcycles, and emergency vehicles. The HOV lanes will operate full-time.

  • Why wasn't this done when the Camp Bullis and Dominion overpasses were built?
    At that time, TxDOT had not completed the required planning and environmental studies for a mainlane expansion and there was no funding for such a project. The Camp Bullis overpass was rebuilt to provide space beneath it for urgently-needed intersection improvements necessitated by nearby development. The Dominion overpass was built to facilitate convenient circulation and emergency access in conjunction with converting the access roads to one-way, which itself was necessitated by traffic growth in the area. Waiting to complete those projects until the mainlane expansion project development was completed and funded would have delayed the much-needed improvements they provided. However, planners designed those projects to easily facilitate future expansion of the mainlanes. Like many things in life, highway improvements often are incremental due to real-world constraints.

Schematics: Detailed schematics are available on TxDOT's project page (see link at the bottom of this page.) Below are before and after cross-sections of the project.



Number of access road lanes varies depending on location.
Diagrams are for illustrative purposes only and are not to scale.

Rendering of I-10 HOV lane looking inbound north of Dominion Dr

Other sites of interest
TxDOT - I-10 from FM 3351 to La Cantera Parkway
I-10 project animation

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This page and all its contents are Copyright 2017 by Brian Purcell

The information provided on this website is provided on an "as-is" basis without warranties of any kind either express or implied.  The author and his agents make no warranties or representations of any kind concerning any information contained in this website.  This website is provided only as general information.  The author expressly disclaims all liability with respect to actions taken or not taken based upon the information contained herein or with respect to any errors or omissions in such information.  All opinions expressed are strictly those of the author.  This site is not affiliated in any way with any official agency.