Kerbs, Lips and Surface Transitions

Small changes in level can create major accessibility barriers.

The Problem

Even minor lips or height changes can:

Stop a wheelchair
Catch small front wheels
Prevent hoist deployment
Create tipping risks

Real-World Impact

Powerchairs cannot be lifted over obstacles.

If the surface is not smooth:

The user may be stuck
Assistance may be required
The space becomes unsafe

Good Design

Smooth, continuous surfaces
No abrupt level changes
Bevelled transitions where required
Flush connections between surfaces

What to Avoid

Kerbs beside access aisles
Sudden drops or rises
Poorly finished asphalt or concrete joins

Bottom Line

If the wheels cannot move smoothly, the space is not accessible.