I find this dubious that a DUI arrest could occur, unless the police (policy enforcers) claimed he was driving in a motor vehicle with DUI, and the bicycle was just incidental as the means of evading them.
For a DUI to stick legally, it is that one is operating a motor vehicle, under ‘contract’.
The State can do this because they essentially have allodial rights as per the title of the automobile (we grant the State these rights when we purchase the auto, by allowing the dealer to send the manufacturer’s MCO/MSO to the respective State Motor Vehicle Registry.
In Florida, it does not have to have a ‘motor’, just a means of moving your butt. Even roller skates....................