Traffic was a nightmare for drivers who usually head westbound on the Katy Freeway Tuesday evening.

The lanes have been blocked since this morning when a big rig spilled formic acid on I-10 westbound near the 610 West Loop. Later, all the lanes of I-10 East at Houston Avenue were shut down when a heavy truck hit the overpass.

The Houston Fire Department worked with a contractor to clear the scene. They had to offload the big rig's contents before they could tow it.

There is no danger to the public and there are no evacuations or shelter-in-place orders in effect at this time.

Drivers are advised to start planning alternate routes. Here are some suggestions from KHOU 11 Traffic Reporter Darby Douglas:

  • 69/59 Southwest Freeway
  • San Felipe
  • Westheimer
  • Richmond
  • Loop 610 to 290 and Hempstead Hwy.

More information from Alert Houston:

Park & Ride and METRO Bus Service

People using METRO Park & Ride should visit, or follow @METROHouAlerts on Twitter for information on impacts to Park & Ride service along I-10.

Katy Managed Lanes

For information on the Katy Managed lanes along I-10, visit the Harris County Toll Road Authority website at or on twitter at @HCTRA.

Steps to Take

Houston residents affected by the traffic associated with this closure should:

  • Expect significant delays on their ride home.
  • Check with family and friends to make alternate plans for picking up children if needed.
  • Ensure vehicles have enough fuel before heading out towards the west side.
  • Follow TxDOT message signs and Houston Police instructions.
  • If possible, attempt to avoid traveling during peak times. This may mean spending more time in the downtown or inner loop area. For a list of downtown events happening this evening, visit

Stay Tuned

For up-to-date traffic information, visit and follow @HoustonTranstar and @TxDOTHoustonPIO on Twitter.

Additional alerts will be issued as appropriate, and posted to