Slips, trips and falls account for a significant percentage of injury incidents occurring in farm buildings, structures and facilities. Falling from any height is hazardous and can be fatal. Injuries (strains, sprains, bruises to joints and muscles, ligaments, tendons and bones) often occur because of poor initial design and maintenance. This includes missing walkways, leaving materials in walking aisles, deteriorated steps and stairs, unprotected openings, poorly maintained ladders and walking surfaces made slippery from rain, mud, manure, chaff or other substances. Falls from height can also be caused by working on fragile roofs, on silos or on the top of high vehicles without adequate protection. Inadequate lighting or poor visibility can also be a significant factor. For example, the risks of slips, trips and falls can increase when entering poorly lit areas from well lit ones or vice versa. Workers carrying objects that block their view or are too heavy or awkward increase the risk of accident.