Police said later Tuesday that the officer was walking and talking and his injuries were considered not life-threatening.
The crash happened shortly after 3 p.m. on the southbound side of the freeway, near Barton Road, according to the San Bernardino County Fire Department. Whether any vehicles besides the motorcycle were involved was unclear.
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All southbound lanes except one were closed while crews worked to clear the scene.
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The cause of the crash is under investigation.