BETHPAGE - The "move over" law requiring motorists approaching emergency vehicles on roads to slow down or change lanes went into effect in January, but police in Nassau say many drivers don't seem to know about it. For the next two weeks, police will be watching for drivers breaking the law. The violation comes with a fine of up to $275 and two points on the license. Under the law, if you see a stopped police car, ambulance or fire truck with its lights flashing, you must move to another lane; if that lane is occupied, you must slow down and exercise caution.Last February, Nassau police officer Michael Califano died after investigators say motorists failed to "move over." Since 1999, more than 160 cops have been killed on highways across the country by drivers who failed to switch lanes.