Why are multi-trunk trees generally avoided for street tree planting?

Multi-trunk trees are generally avoided for street tree planting primarily because their branches may droop into traffic. This characteristic can pose visibility issues for both drivers and pedestrians, increasing the risk of accidents. As these trees mature, the weight distribution of multiple trunks can lead to lower branching and more dense canopies, making it more likely that branches will encroach on roadways and sidewalks. This poses a safety concern, as well as the potential for damage to vehicles and interference with pedestrian movement.

While other considerations, such as drought resistance, fertilizer requirements, and invasiveness, are important factors in selecting trees for urban landscapes, the physical space and traffic safety are paramount in street tree selection. Ensuring that trees do not obstruct traffic and maintain safe clearances is critical in maintaining urban infrastructure and promoting safety for all road users.