Yes, it can be dimissed, but you will have to 1) go to court on the trial date--this will not be done other than at court; 2) have your evidence (e.g. passport, plane tickets, overseas hotel bill, etc.) to show that you overseas then, as well as any other witnesses (e.g. spouse) who will support you; and 3) you  will also need to explain why your car was photographed going through a redlight--that is, who was driving it, if you were not.