A man has been caught on camera riding his mobility scooter in the fast lane of one of Brisbane's busiest roads, slowing down traffic on Thursday.

Account manager Chris Jones who works out of an office on Coronation Drive at Milton was gazing out his lunchroom window with colleagues when he spotted what he called the "speed racer" about 10.30am.

"We were in the lunchroom having a coffee as you do and looked out onto the road and we could see a little mobility scooter coming past in the right hand lane," he said.

"There was a bus behind him trying to get past and a whole lot of traffic behind him.