SBS Transit's Green PIW backrest?

For most commuters on SBS Transit's latest wheelchair accessible buses, we would all have been familiar with the Passenger-in-wheelchair bays.

A standard wheelchair bay on a SBS Transit Scania K230UB.

Do you notice the yellow stickers on the right?

Position wheelchair against "green" backrest in locked position.

Let's take a look at the "green" backrest.


The backrest is yellow.

 It might turn out to be another "Use Hammer to Break Window Glass" that was featured on STOMP ^^.