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When buses stand on level roads their ramps should ideally not exceed a slope
of 1 in 6 to the kerb (if the kerb is 100mm in height) and 1 in 3 to the road
if the bus has a kneeled step height of 250mm. To achieve these gradients the
ramp must be able to be extended at least 850mm beyond the step edge.
Ramps can also act as a bridge if the bus is unable to get close to the kerb
due to parked vehicles or poor road surfaces on the approach to the stop.
The ramp should preferably be powered to make deployment quick and easy. However,
powered ramps must be able to be operated manually if power systems fail.
Ramps must also incorporate safety systems that stop the ramp if someone walks
into or is standing in the way of the ramp.
A ramp is yet to be designed that does not have a lip. However, if the lip is kept to a minimum of 6mm then the hazard will be minimal.
Ride
height and step heights, Entrance handrails, External
features of buses
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