TRUCK WAS IN PARK WAS OUT OF TRUCK FOR ABOUT 15 MINUTES. TRUCK STARTING MOVING HIT END OF BRIDGE AND CAUSED APPROX. $2,500.00 DAMAGE TO TRUCK AND IT WAS STILL IN PARK. WAS LOOKING AT BRIDGE AT JOB SITE AND HAD WALKED BEHIND TRUCK TALKING TO JOB SUPERVISOR AND I\ THEY TOLD ME MY TRUCK WAS MOVING. LUCKY NOBODY WAS IN FRONT, COULD HAVE HURT SOMEBODY!! THERE WAS 2 WITNESS TO THIS BESIDE ME. RAM HAS A SAFETY ISSUE WITH THIS. I WENT TO DEALER AND WAS TOLD TO APPLY PARKING BRAKE EVER TIME I EXIT PICKUP,THIS IS A PROBLEM AND THEY KNOW IT WHY SHOULD I APPLY BRAKE WHEN I PARK WHAT IS PARK FOR. THEY DIDN'T HAVR THERE NEW PICKUPS ON LOT PARKING BRAKES APPLY?