His argument was challenged by the managing director of Segways New Zealand, Philip Bendall, who said about 100 of his customers were mobility-impaired.
With users having to step only eight inches above the ground to get into Segways, he said it was not too great a height to impede both disabled and able-bodied people to use them.
He has done tests on the power output and repairs on Segways and argued that the motorised scooters' maximum continuous power output was between 735 watts and 750 watts.
Mr Bendall said the problem with the NZTA assessment was that it didn't consider that Segways have unusual motors in that if one failed, another provided back-up power.
Mr Summers has two artificial knees as well as a metal rod holding a femur together.