AFTER ARRIVING HOME IN OUR 2016 FORD TRANSIT VAN, WE PARKED IN OUR DRIVEWAY AND PLACED THE TRANSMISSION INTO THE PARK POSITION AND SET THE EMERGENCY BRAKE. OUR FAMILY OPENED THE DOORS AND PROCEEDED TO EXIT THE VEHICLE. OUR FOUR YEAR OLD SON, HOWEVER, HAD UNBUCKLED AND TWISTED AROUND IN HIS SEAT SUCH THAT HE BECAME TRAPPED IN HIS SEAT BELT. THE MORE HE STRUGGLED TO GET FREE THE MORE IT RATCHETED TIGHT... TO THE POINT THAT HE COULDN'T BREATH. DESPITE US TRYING EVERYTHING TO FREE HIM, THE SEAT BELT WOULD NOT RELEASE HIM. FEARING THAT HE WAS IN REAL MEDICAL DANGER, I CUT HIM FREE THEREBY RENDERING THAT SEAT BELT UNUSABLE. I AM CONCERNED THAT THE SEAT BELTS ARE DEFECTIVE IN THAT THEY FAILED TO RELEASE PROPERLY WHEN THE VAN WAS PLACED IN PARK AND THE DOORS WERE OPENED.