Quote:
Originally posted by Shizuka
When you see them turn on the siren just as the light turns red and barely get to the other light before turning it off 
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If a road isn't busy and they don't need cars to get out of the way, they won't use the siren - just flashing lights. At intersections, especially when going through red lights, they put the siren on to warn people... I don't think it's because they don't want to wait at a red.