WIFE WENT TO PARK CAR IN DRIVEWAY BETWEEN GARAGE & STREET AND WHEN EXITING THE CAR, THE CAR BEGAN TO ROLL BACKWARDS. SHE TRIED TO GET BACK INTO CAR AS 2 GRAND KIDS WERE IN THE BACK SEAT. AFTER SEVERAL ATTEMPTS TO GET IN, THE CAR DOOR KNOCKED HER DOWN & THE CAR CONTINUED TO ROLL INTO STREET UP ON NEIGHBORS FRONT LAWN ACROSS THE STREET. SHE WAS KNOCKED UNCONSCIOUS AND SUFFERED BRUISES UP & DOWN HER RIGHT SIDE WHEN I RETRIEVED THE CAR, FOUND IT IN "PARK" & ENGINE WAS TURNED OFF. KEYS WERE STILL IN IGNITION BUT IN OFF POSITION. DRIVEWAY HAS A SLIGHT DOWNGRADE BUT NOT WHAT I CONSIDER SIGNIFICANT. NEIGHBOR HAD OUTSIDE CAMERA WITH AUDIO BUT DID NOT HAVE VEHICLE IN PICTURE. IT DID HAVE AUDIO OF CAR GOING CLICK, CLICK, CLICK, CLICK, CLICK, ETC. AS IT ROLLED BACKWARDS TILL IT CAME TO A STOP. VERY FORTUNATE IT DID NOT COLLIDE WITH ANYTHING BEHIND IT OR ANY TRAFFIC CROSSING STREET AS WOULD HAVE BEEN DISASTROUS. WIFE WAS TAKEN TO HOSPITAL AND REQUIRED FOLLOW-UP VISITS WITH SPECIALIST & ALSO HAD A RETURN VISIT TO HOSPITAL WITH COMPLICATIONS FROM HER CONCUSSION. DEALER FOUND INTERMITTENT BINDING IN PARK PAWL LINKAGE AND ADJUSTED SHIFTER CABLE FIRST. COULD NOT DUPLICATE PROBLEM. FURTHER DISCUSSION WITH GM WERE INSTRUCTED TO REPLACE PARK PAWL AND COMPARTS INCLUDING LINK ARM W/SPRING. DID FIND RECALL ON 2014 CHEVROLET TRAVERSE MATCHING DESCRIPTION OF MY EXPERIENCE WITH TRANSMISSION NOT ENGAGING IN "PARK" & ROLLING. INTERESTING THAT THE 2013 WAS THE YEAR THE TRAVERSE WAS REDESIGNED