I live in Olathe Kansas, the home of the Kansas State School for the Deaf. Kids come here to go to school, and they stay because our town has a vibrant deaf community and a deaf cultural center.
If deaf people could not drive, we would have a lot of deaf people walking. Yes, deaf people can drive. As in all populations, there are good drivers and lousy drivers. They can see the flashing lights on emergency vehicles, so the siren is just frosting on the cake.
One poster said that they don't talk while driving, so they are safer. Wrong. They do talk when they are driving, and that is hazardous, since they sign, it can take their eyes off the road. A brief comment is fine, but a protracted conversation is downright hazardous!
Should deaf people drive? Absolutely! Should they talk and drive? No way!