A helmet does impede hearing, but not by much, and that's not what I meant. I meant they could ticket and fine drivers with turbans. The law seems like basic safety, so maybe there's a equivalent Canadian law already.

To check myself against spouting baloney, I looked up the law (vehicle code 27400) and it's specifically written for headphones and earbuds, although Grok tells me that "courts and enforcement have interpreted to mean any contact or coverage that could impair hearing in both ears." So in theory someone with a thick turban could be ticketed. But I doubt it will happen. (TBH I don't even know if turbans actually interfere with hearing.)

California already exempts police and emergency vehicle drivers from the law (and anyone driving loud construction equipment, which makes sense), so they'd probably just add an exemption for bus drivers if anyone cared. And O, Canada nowadays would probably arrest an officer who wrote that ticket no matter how much legal backing he had.