My Roommate Loses Consciousness Randomly Like A Light Switch Getting Flipped Off. He Just Bought A Van. What Should I Do To Try To Keep People Safe? Wa

A couple years ago my roommate sold his car. Since then he hasn't driven but he has lost consciousness in front of me around ten times. He will be in the middle of a sentence and his head will drop. I can revive him by calling his name. It takes a couple seconds for him to come around. This happened while he was sitting at his desk last year and he fell and broke a rib.
He mentioned getting a car and I said he couldn't drive because he has narcolepsy. He said he wasn't formally diagnosed. That was the end of the conversation.
Yesterday he bought a van.
Who do I reach out to? We live in an area with a lot of pedestrians and the sidewalks aren't raised so there is nothing to deter a tire from going off the road.
EDIT: My question is answered. Thank you.
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