Crown Lifting involves removal of lower branches of a tree. The objective is to provide head height clearance for buildings, signs, vehicles, and pedestrians. The resulting live crown ratio should be more than 60% of the leaf canopy. Excessive removal of lower limbs should be avoided so that development of trunk taper is not affected.
The Highways Act 1980 requires trees and vegetation do not obstruct the passage of other users. The Highways Authority requires a clearance height of 2.5m over footpath and 5.2m over roads.