A motorist says he was driving on Interstate 5 south of Seattle when he saw the message "U Suck" on an overhead sign.

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The Washington State Department of Transportation has apologized for an “inappropriate message” that appeared on one of its traffic signs.

Motorist Ruslan Kozlov tells KCPQ-TV he was driving on Interstate 5 south near Seattle-Tacoma International Airport Tuesday afternoon when he spotted the message “U Suck” on an overhead sign.

WSDOT said it was “clearly a mistake” that was caused by a “training error.” The agency says it’s taking steps so it doesn’t happen again.