(1)  A bus must be fitted with a suitable rail or partition in front of any seat located on the left side of the bus immediately behind a step so as to prevent persons from falling into a step well.

(2)  A large bus must, if the driving position is not otherwise separated from the passenger compartment, be fitted with a suitable guard rail or other structure so as to prevent passengers from –

(a) coming into contact with the driver or the controls; or

(b) obstructing the driver's view.