It doesn't seem to matter what time of day it is. We saw drivers ignoring lights and sirens during daylight and nighttime hours. Sometimes drivers pull to the left, instead of the right. Other times, they're not sure what to do. Ambulance drivers say if you are stopped at a crowded intersection, the best thing to do is to stay stopped and wait for instructions from the ambulance driver.
All emergency vehicles have loud speakers that drivers can use to give instructions.