The Danbury Police Department is cautioning drivers to a road closure tonight.   Deer Hill Avenue will be temporarily closed from 4:30pm to 9pm for children to "trick or treat".  The closure is from West Wooster Street to Southern Boulevard.  Motorists are asked to use caution while driving and to expect heavier than normal traffic.  Even though the weather looks frightening, the Danbury Police Explorers will still be handing out candy in the front lobby of the Police Department starting at 4pm.