We sometimes forget such simple safety guidelines as: never climb electricity pylons under any circumstances; or that power cables are not clotheslines and no shoes or other objects should be hung on them.
Whenever doing something beneath overhead power lines (such as fishing or carrying large objects), you should also be careful to avoid any contact or discharge.
When driving or operating large vehicles (such as lorries), it is also important to check the area in advance to ensure there is enough headroom so that collisions with overhead power lines can be avoided if any are found in the area.