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For most right-of-way uses, safety remains a major reason for managing vegetation. Trees, brush and weeds along these rights-of-way can create hazards. For driver and passenger safety, vegetation must not be allowed to block traffi c signs or roadside markers. It also must not conceal guardrails or overtake road shoulders. Vegetation must not obstruct driver vision at intersections or block the line of sight around curves. Excessive vegetation also prevents proper drainage, which can damage roadbeds by creating potholes and other hazards. Trees growing into power lines can cause electrical power outages and make maintenance diffi cult and dangerous. In addition, areas around utility substations and land beneath transmission towers require a vegetation-free zone to prevent fi re hazards and ensure the transfer of electricity. Railroad companies need to control weeds along their rights-of-way to maintain roadbeds. Weeds hold water around railroad ties. This causes the ties to rot, increasing chances for derailment accidents. Sparks from the rails can ignite weeds and brush growing too close to the roadbed, and can create a fi re hazard. Brush that obstructs motorists’ views at railroad crossings is especially dangerous. Controlling it can help avert car/train accidents. Foresters control vegetation to maximize the amount of timber they can harvest, resulting in more timber harvested on less land. Controlling brush also decreases the potential for forest fi res and allows young stands to get started. Invasive plants, the ones that affect all of the areas we have talked about, threaten to create a monoculture