Worked well
I bought this item because reviews stated that it stayed in place while a power chair went over it.  My doorway threshold from inside the house to the carport is narrow and was 1.5 inch high.  The power chair was bouncing as it went through the door damaging the door frame and the chair. Although the ramp does not interlock with the threshold, the power chair now goes through the door without bouncing and damaging the door.  I was concerned at first because the instructions when received stated to screw the ramp to wood or cement to secure it.  That is not practical on the inside of the house.  However the ramp does stay in place as the chair goes over it.  I am very satisfied.
Rating: 5 stars