Why wouldn't deaf driver have sticker to put on license plate? Like some handicapped people do have symbol on license plate.
Sometimes deaf person do not have pen and paper with them. They are still human being, sometimes they forgot to bring or the paper ran out. I always try my best to bring it with me all the time even if it's a pain in neck to do so. Sometimes I just don't have it. I don't see any harm in hoping that hearing people do the same. If they refused, then that's their problem not our. If they accept then great...
It would be nice for polices to have different strategies to deal with deaf people. It's bad enough that we have to guess if cop want to us to open our car window or not. Or to lay on the road or not...and if we misunderstood the cop then we get shot.
