Drivers on the northbound 15 freeway spotted a surprise on a Caltrans sign Christmas night: a pro-Trump message.

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A Caltrans spokesperson said someone had apparently hacked into and reprogrammed the northbound 15 Freeway sign at Ontario Avenue in Corona to read: “Inland Empire supports Donald Trump. Merry Xmas. Vote Donald Trump.”

No one knows how long the sign ran for before being noticed and changed by officials.