That was me. A police officer can't ask you for a driver's liscense if you aren't driving a motor vehicle. He or she will ask you for identification.
My souce has a small back story: One of our Tuesday riders was tickted for running a stop sign, and the violation appeared on his driving record and he incurred a higher insurance cost. He asked the lawyer in the group how he could get this corrected. The first thing the lawyer said was, " Don't carry your driver's liscense with you when you ride, but some other form of legal ID. The court's can't put the violation on your record without the DL."