Sounds like their marking their territory.
May be a nest or something close by.
What you can do next time is drive to an open place (like a wilderness area), use a CO2 fire extinguisher on them, they should fall off (or very easily sweep them off with a pair of gloves as frozen and dead bees can still sting you) andthen drive off. The bees will be frozen for a little bit, then they'll thaw and resume their normal bee lives.
I agree with not killing them. Believe or not it's not as easy being a bee as it used to be.
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