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The first, I guess... A roof on top of the roof makes that it doesn't get deadly hot in the full sun. Plus they might need it for storage space. School buses don't have large storage compartments by nature.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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