A low-floor bus has its entrance floor close to road level, typically around 30 cm rather than the 90 cm or so of an older high-floor design, and no interior steps between the door and the wheelchair bay. Most also kneel: the suspension lowers the kerbside of the vehicle by several centimetres at a stop, cutting the remaining height difference and reducing the ramp angle. Between the two features, boarding becomes a short shallow slope rather than a climb, which also helps older passengers and anyone with a buggy or heavy luggage.
The ramp is what closes the last gap, and its type shapes the experience. A manual ramp is a flip-out plate the driver leaves the cab to deploy, which takes a few seconds and depends on the driver being willing and able. An automatic ramp extends at the push of a button from the cab. Manual ramps are more common, mechanically simpler and less prone to failure; automatic ramps are faster and remove the negotiation, but a jammed one is out of service until maintenance. Neither works if the bus cannot pull flush to the kerb because a car is parked in the stop.
The wheelchair bay is a single designated space, usually opposite the door, with a backrest and a bell. It is where the well-known conflict with buggies happens. Bus operators generally give wheelchair users priority in the bay, and in the UK the Supreme Court decided in 2017, in FirstGroup v Paulley, that a driver must do more than politely request that a buggy be moved, though the court stopped short of requiring passengers to be compelled to get off. The result is a duty to take further reasonable steps rather than a right to have the space cleared on demand.
On the day, the practical failures are ordinary ones. The bay is occupied and nobody moves. The ramp is broken and the driver waves you towards the next service. The bus stops a metre from the kerb because of a parked car, making the ramp too steep to use safely. The bus is full and the driver does not stop at all. None of these appear in a fleet specification, which is why an operator’s low-floor percentage tells you what should happen rather than what will, and why a second service is worth budgeting time for.
That said, buses are frequently the most reliable accessible mode in a city with a poorly retrofitted metro. Where whole fleets are low-floor, coverage is dense and the ramp is a routine part of a driver’s day, a bus network can carry a wheelchair user places the rail network cannot reach. We record fleet type and ramp provision alongside the rail step-free data for that reason, because the accessible route through a city often runs on the surface.
Low-floor bus: common questions
- What is a low-floor bus?
- A bus whose entrance floor sits around 30 cm above the road, with no interior steps between the door and the wheelchair bay. Most can kneel towards the kerb to reduce the height difference further, and carry a ramp so a wheelchair user can board without assistance from other passengers.
- Do wheelchair users have priority over buggies in the bus bay?
- In principle yes, though it is not absolute. In the UK, the 2017 Supreme Court ruling in FirstGroup v Paulley requires a driver to do more than make a polite request when a buggy occupies the space, but it did not create a power to force other passengers off. In practice it depends on the driver and the passengers.
- Is the ramp on a bus automatic or manual?
- Both exist. A manual ramp is a flip-out plate the driver leaves the cab to deploy, which is simple and reliable but depends on the driver. An automatic ramp extends from a button in the cab, which is faster but leaves the bus without a ramp when it jams. Manual ramps remain more common.