Transportation officials in Texas said an equipment malfunction was to blame for electronic highway signs erroneously giving the speed limit as 20 mph.

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The Texas Department of Transportation said the regular posted speed limit is in effect, despite the digital signs on U.S.-59, near the State Highway 288 interchange and Chimney Rock, reading: "Speed Limit 20."

"We have new portable message boards as part of new 69/610 project smart work zone technology and they are malfunctioning. We are working to get it resolved," TxDOT spokesman Danny Perez told KTRK-TV.

Similar electronic signs have proven vulnerable in the past, often due to human interference.

The Washington State Department of Transportation apologized in April 2018 for a "training error" that caused a digital sign on Interstate 5 to display the message, "U Suck."