Reason's to keep your tree's trimmed

Here are good reasons to keep a tree trimmed

Here Is a few important reasons to hire a tree service to maintain your trees. These are just a few that we found and if you know some more let us know in the comments.

Trees are generally trimmed for one of three purposes: aesthetics, safety or health. For example:

• Aesthetics – Pruning a tree effectively helps to maintain its shape and appearance. However, you shouldn’t try to impose an unnatural shape or size on a tree. The amount
  
  of trimming and pruning that will be needed could seriously damage it.

• Safety – Dead or broken branches and limbs can fall off at any time, which is a serious safety hazard. If the branches of a tree obstruct your vision while driving, they should be trimmed away. Finally, tree limbs and branches occasionally grow too close to utility lines. Contact the utility company to handle such issues.

• Health – It is sometimes possible to save an infected tree by strategically pruning away affected branches and limbs. Thinning the crown of a tree improves airflow, which can be very beneficial. If branches are crossing or rubbing together, they should be trimmed so that they don’t fall unexpectedly. http://www.treeremoval.com/trimming-and-pruning/

 Here is Osha's safty tips that every tree services needs to follow

These are more then just tips but in some states these recommendations are required by law.

• Do not trim trees in dangerous weather conditions.

• Perform a hazard assessment of the work area before starting work.

• Eliminate or minimize exposure to hazards at the tree and in the surrounding area.

• Operators of chain saws and other equipment should be trained and the equipment properly maintained.

• Use personal protective equipment such as gloves, safety glasses, hard hats, hearing protection, etc., recommended in the equipment manufacturer’s operating manual.

• Determine the tree’s felling direction. Address forward lean, back lean, and/or side lean issues.

• Determine the proper amount of hinge wood to safely guide the tree’s fall. Provide a retreat path to a safe location.

• Inspect tree limbs for strength and stability before climbing. Tree trimmers working aloft must use appropriate fall protection.

• Do not climb with tools in your hands.

• If broken trees are under pressure, determine the direction of the pressure and make small cuts to release it.

• Use extreme care when felling a tree that has not fallen completely to the ground and is lodged against another tree.

• Never turn your back on a falling tree. 

• Be alert and avoid objects thrown back by a tree as it falls.

 https://www.osha.gov/Publications/3301-10-05-english-06-27-2007.html

Obviously Osha is strict about safty but all the safty tips are written to prevent a incident that happened multiple times in the past.