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trees, and some tropical species are known to cause damage when
fruit falls onto pedestrians or vehicles.
Insects and other animals. Trees often serve as nesting habitat for a
variety of animals. When disturbed, some may bite or sting, causing
minor to severe injuries.
Lightning. Lightning strikes trees because of their height and conductivity. Strikes can result in serious damage to the tree. Large splinters
of wood may be thrown when the tree is struck. Even strikes that do
not cause extensive tree damage can side flash to people, animals,
structures, and underground utilities, and may result in injury, death,
damage, or fire.
Low branches as obstructions. Low branches can cause damage to
vehicles or harm to pedestrians, especially at night. Many municipalities have regulations that define the minimum vertical clearance
allowed over streets and sidewalks.
Obstruction of traffic control signs, signals, and views. When
tree branches obstruct traffic control signs and stoplights, vehicles
may fail to stop or yield to opposing traffic. The same is true with
obstructed views. If branches obstruct the view of traffic at intersections, driveways, or railroad crossings, drivers may not see oncoming
traffic or pedestrians.
Pavement lifting. As tree roots grow in diameter, they can lift
concrete and heave asphalt pavement and pavers, which can result
in an uneven surface. The maximum allowable amount of pavement displacement is regulated in some communities and in some
countries.
Road-edge trees. Out-of-control vehicles might crash into trees that
are near the edge of a road, resulting in personal injury or property
damage. Trees close to the road edge may limit drivers' ability to see
large animals, such as deer or moose that cross regularly. The distance from the edge of the road to a tree is regulated in some areas.
In general, the higher the speed limit, the greater the required " clear
zone " (the distance between the road edge and trees).
Root damage to infrastructure. Roots can penetrate cracked or
leaking pipes, causing the disruption of flow. Roots can also grow
around and break pipes, causing leakage and the potential for explosion if gas lines are broken.
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BMP - Tree Risk Assessment
Table of Contents for the Digital Edition of BMP - Tree Risk Assessment
Table of Contents
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