Danbury Police are seeking the public's help in their investigation of a car crash that sent three people to the hospital on Sunday.  Officers responded to Clapboard Ridge Road shortly before 9pm on a report os a serious collision.  A Honda CRV was headed south when it crashed into a Honda Accord headed north.  Both operators and a passenger from the Accord were transported to Danbury Hospital.  The Traffic Division is looking for witnesses that might have information to contribute to the investigation.