HELP with RFID

I am currently working on a traffic light project with the arduino uno and i am using all of the pins(2-13) except 0 and 1(which i am using for the rfid). i need the rfid to be listening while the traffic light is going through its cycle and alert me when it reads a tag(i dont need to know the data from the tag; just that it read). I know the interrupt pins(2,3) and i can't seem to use the 0,1 pins for the lights instead. Is there a way for the serial to run in the background and alert me when it reads or something close? any help is much appreciated