AS I TOOK A HIGHWAY EXIT, FOLLOWING BEHIND OTHER CARS DOING THE SAME, MY PRIUS REFUSED TO BRAKE EFFICIENTLY WHEN ANOTHER CAR ABRUPTLY INVADED OUR LINE. IT FELT AS IF THE BRAKES MADE A SLIGHT RELEASE OR COULDN'T REACH A FULL STOP. I HAD ENOUGH SPACE TO STOP, AND I PRESSED THE BRAKES ON TIME BUT THERE WAS ALMOST NO BRAKE REACTION AND I CRASHED INTO THE TRUCK IN FRONT OF ME. I WAS PROBABLY GOING 20-30 MPH, SOMEWHERE IN THE MIDDLE... SO NOT EVEN THAT FAST. BEST PART IS THAT THE AIRBAGS DIDN'T INFLATE, EVEN THOUGH THE CAR WAS ALMOST TOTALED. THIS FEELS EXPLAINABLE TO ME... I HAD IT FOR ONLY TWO MONTHS THUS FAR. I DO NOT RECOMMEND THIS CAR TO OTHERS.