Greater Houston, Southeast Texas and statewide

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Houston RoadsFreeway traffic, congestion and corridor guides

The busiest count station in Harris County, on the Katy Freeway near Old Voss Road, averaged 330,394 vehicles a day in 2025. Seven of the 10 most congested road segments in Texas are in Houston.

Each corridor guide collects what public data say about one Houston freeway: where its traffic peaks, how much of that traffic is trucks, where it ranks for congestion, what crash data exist for it, and which construction projects are funded, under way or still on paper.

The volumes are among the largest in the state. TxDOT’s 2025 counts put the Katy Freeway near Old Voss Road at 330,394 vehicles a day and the 610 West Loop north of I-10 at 303,669.1 In the Texas A&M Transportation Institute’s 2025 ranking, the West Loop between I-10 and I-69 was the most congested road segment in Texas for the third straight edition, and 36 Houston-area segments made the statewide top 100.2

Congestion and danger are different measures. TxDOT reports deaths by road class rather than by named freeway: in 2025, 134 people died on interstates in Harris County, up from 85 in 2015.3 Houston’s most dangerous highways sets out what that official data can show and how the published freeway rankings were calculated.

Corridor guides

Houston freeway network with corridor guidesBayportBarbours CutTurning BasinDowntownGalveston BayPasadenaBaytownLa PorteKatySpringHumblePearlandSugar LandI-45I-45I-10I-10610I-69I-69BW 828822529099146249
Map: Texas Mobility Outlook from TxDOT roadway centerlines and county boundaries.
CorridorBusiest 2025 AADTWorst TTI rank
I-45Interstate 45 (North Freeway and Gulf Freeway)271,938No. 7
I-10Interstate 10 (Katy Freeway and East Freeway)330,394No. 6
I-610Interstate 610 (the 610 Loop)303,669No. 1
I-69 / US 59Interstate 69 and US 59 (Southwest Freeway and Eastex Freeway)297,474No. 2
Beltway 8Beltway 8 and the Sam Houston Tollway197,362No. 27
SH 288State Highway 288 (South Freeway)180,000No. 34
SH 225State Highway 225 (La Porte Freeway)129,148Not ranked

AADT: TxDOT annual average daily traffic at the busiest count station on the corridor, 2025. TTI rank: position of the corridor's worst segment in the Texas A&M Transportation Institute 2025 list of the 100 most congested road segments in Texas.

Sources

Figures were read from the documents below and checked by Texas Mobility Outlook. Links go to the original publisher. Accessed October 2026 unless noted.

  1. TxDOT Transportation Planning and Programming Division, TxDOT Annual Average Daily Traffic Counts (Public View), June 29, 2026. AADT 2023-2025 by count station. Station locations from TxDOT coordinates.
  2. Texas A&M Transportation Institute (TTI), 2025 Texas 100 Most Congested Road Segments (all vehicles and trucks), November 24, 2025. Rankings reflect calendar year 2024 traffic data.
  3. TxDOT, Fatal Crashes and Fatalities by County and Road Type, 2025. Harris County row, combined rural and urban section.