It is not hard to find out that, in the TTC bus, the floor of the front door can be lifted and become a slop for people who need it to get on. Except for the hidden slop footway, I find out that the distance between the floor of the carriage and the ground is adjustable. Drivers can control the bus to raise or reduce in height to satisfy different needs and conditions of passengers. For example, there is an older people want to get on the bus. Then the bus can lower its height to make it easier to get on.
Olivia's Blog 