I WAS DRIVING ON THE HIGHWAY MERGING ONTO RT3 FROM I-95-S TOWARDS CAPE COD BY SOUTH QUINCY AREA. THE CAR IN FRONT OF ME STOPPED SUDDENLY AND I SLAMMED ON MY BREAKS, THE CAR BEHIND ME ENDED UP REAR-ENDING MY CAR WHICH RESULTED IN ME HITTING MY HEAD ON MY HEAT REST WHICH RESULTED IN WHIPLASH. THE WOMAN WHO HIT ME CLAIMED SHE CALLED THE POLICE AND SAID THAT THE COP TOLD HER WE NEED TO EXCHANGE LICENSES AND REGISTRATIONS. WE DID EXACTLY THAT BUT NOT PHONE NUMBER OR ANYTHING. AFTER WE EXCHANGED, SHE TOOK OFF RIGHT AWAY. THE CAR THAT STOPPED IN FRONT OF ME LEFT THE SCENE RIGHT AWAY. THIS WAS MY FIRST ACCIDENT SO I DID NOT KNOW WHAT TO DO BUT NOW I AM REALIZING THAT SHE MAY NEVER HAVE CALLED THE POLICE CONSIDERING THAT NO ONE SHOWED UP AND THIS HAPPENED ON THE HIGHWAY.