Massachusetts: https://mutcd.fhwa.dot.gov/htm/2009r1r2/part7/part7b.htm#section7B10 https://mutcd.fhwa.dot.gov/htm/2009r1r2/part7/part7b.htm#sec... Can be time

Massachusetts: https://mutcd.fhwa.dot.gov/htm/2009r1r2/part7/part7b.htm#section7B10 https://mutcd.fhwa.dot.gov/htm/2009r1r2/part7/part7b.htm#sec... Can be times of day, "when flashing", or "when children are present". Time of day isn't great because of irregular after school activities, events, delayed starts because of snow, etc.