level in lawns or paths. Cracks, pot-holes or uneven surfaces in driveways, paths and steps. Slippery paths, paving or steps. Unprotected banks and retaining walls ? under the Building Code banks and retaining walls may require a non-climbable barrier when the fall distance is more than one metre. Even if they are not required, they may prevent people from being injured from a fall. Children's play equipment, particularly when installed over a hard surface.