What is the procedure for securing a passenger seated in a wheelchair in a dedicated bus wheelchair bay?

1. Leave the wheelchair loose in the center aisle with brakes off
2. Tie the wheelchair to a passenger seat armrest with a rope
3. Wheelchair users must sit on the floor
4. Position the wheelchair facing rearward against the solid padded backrest (or secure with certified 4-point floor tie-down straps and 3-point occupant lap/diagonal belt), and engage the wheelchair's own wheel brakes