why do school buses have white roofs

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I was going to say but you beat me to it, plus I see you re from Florida.

I have an elastomeric product on my florida room roof. We've been getting white roofs on our buses since 1998, which I think is when Michigan started allowing roofs of school buses to be something other than SB yellow.

Combined with tinted windows and properly opened roof hatches (and of course A/C, but we only have that on our orthos) it makes for a much cooler interior.

My own bus has a faded yellow roof and clear windows.

Makes for a hot trip! I just make sure to open all doors and windows a few hours before I leave in the evening.