This photo was sent to ABC 7 News over Instagram the day after Christmas. It shows a rider on an electric unicycle, holding a cup, and what looks like a GoPro camera with no helmet.
The CHP says they weren't aware of any reports of this incident, but want to remind people it's against the law. If it's not a motor vehicle or a motorcycle, it cannot be on the freeway.
It's not the first time someone was photographed on a small electric vehicle on the Bay Bridge.
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Another man was seen wearing no helmet and riding an e-scooter on the lower deck of the bridge during rush-hour last Halloween.