COMING OUT OF A ROUNDABOUT IN RUSH HOUR WHEN A CAR AHEAD OF HER SUDDENLY STOPPED. SHE HAD ABOUT ONE AND HALF TO TWO CAR LENGTHS AND HER SPEED WAS ABOUT 35 MPH. SHE APPLIED HER BRAKES AND THEY DID NOT RESPOND. HER CAR REAR ENDED ANOTHER CAR. THE AIRBAG DEPLOYED. SHE HAS A SPRAINED NECK AND BACK. SHE HAS BEEN OFF FOR A COUPLE OF DAYS PER DOCTOR'S REQUEST. MAJOR DAMAGE TO THE ENTIRE FRONT END OF THE CAR.