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San Antonio
Freeway system
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    I-10E Exp (410-1604)
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    LP 1604N Expansion
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    LP 1604/FM 78-I-10
    LP 1604/I-35-FM 78
    SH 151 Expansion
    SH 151/LP 1604
    US 90W Expansion
    US 90/Loop 410
    US 281N Expansion
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    US 281/Jones-Mltsbrg
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San Antonio Area Freeway System
Schematics Legend

This page last updated December 14, 2019

General information about the schematics

The freeway schematics found on this site are intended to show the layout of freeway lanes and the relative location of entrance and exit ramps, cross streets, access roads, and other important features. Here are some important notes about the schematics to understand and keep in mind:

  • The schematics are not to scale.
  • Lane layouts are shown for freeway mainlanes, auxiliary lanes, collector/distributor lanes, and ramps. Lane layouts are not shown for access roads or other roadways due to space limitations, the complexity of the lane configurations of those roads, and the desire to keep the clutter on these schematics at a minimum.
  • Lanes on most freeway-to-freeway connectors are truncated to reduce clutter and/or to fit within a reasonable space.
  • Ramps are shown in their approximate position.
  • Except where especially noteworthy, cross streets are shown as perpendicular to the freeway and not at the actual angle of intersection, and the freeway is always shown as straight regardless of any curves or alignment changes.
  • Alignment changes of the access roads on the schematics are done for spacing purposes and do not necessarily reflect alignment changes of the actual access road.
  • Future lane and ramp layouts are shown for areas currently under construction and are based on plans available from TxDOT at the time construction started and may be subject to change.

The schematics were composed by hand in Visio using a combination of field surveying, video recordings, maps and aerial photos, and the author's own personal knowledge.


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This page and all its contents are Copyright 2019 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.