Why are warning signs such an important tool in your site access planning?Without the appropriate safety signage such as Keep out signs, accidents will happen, particularly when children are involved. Dangers such as hazardous materials and unsafe buildings can be avoided by displaying restricted access information. You can advise unwanted visitors to keep away from your private property and illegal trespassing with Keep out signage. Or, you may want to stop access to rooms containing confidential documents for security reasons.