https://www.txdot.gov/driver/share-road/highway-driving.html
Keep Right
Watch for signs on Texas multi-lane highways that read “Left Lane For Passing Only.” These signs let you know that the left lane on a divided highway is not a “fast” lane; it is a passing lane.
After you pass someone, move into the right lane once you’ve safely cleared the vehicle. Impeding the flow of traffic by continuing to drive in the left lane is punishable by a fine of up to $200.
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Coming Soon to a Highway Near You - “Left Lane for Passing Only” Signs
http://www.txdot.gov/inside-txdot/media-center/statewide-news/2012-archive/050-2012.html
The Texas Department of Transportation is installing additional “Left Lane for Passing Only” signs on all highways with a speed limit of 75 mph or higher. State law requires TxDOT to post these signs on highways where slower traffic is asked to stay in another lane.
Same as the law of the highway in Germany, as it was explained way back when I learned it and followed it.
This is my true story, of a trip of about 100 miles to go to the airport at Frankfurt.
My car could cruise at 100 mph, and sometimes I needed to go into the passing lane to go around a slower driver.
So I’m in the passing lane, and a big BMW comes up behind me, flashing lights to ask me to move over, which I do when my pass is complete.
As the BMW flies by me, right on his tail is a Porsche flashing his lights asking the BMW to move over.
This all happened fast, and is burned into my memory as how the system works.
I figured the BMW wanted to go 110+ mph, and the Porsche faster still.
In those days a 911 Porsche would do about 130 mph tops.