An entrance is a point of ingress, where people enter a business, building or other structure. Entrances are to be distinguished from exits. Construction Entrance, Drivers Entrance, or Plant Entrance signs are signs you'd find in parking lots to direct specific workers. Visitors Entrance, Employee Entrance, or This is Not an Entrance are signs you'd find inside a building.
Business entrances aren't always obvious to everyone and in most cases there are different entrances for different people. Someone that's filling out a job application doesn't want to mistakenly walk onto the production floor, and a delivery man doesn't want to try to deliver packages to the sales team. That's why it's important to clearly identify all entrances with specific Entrance Signs.
Signs communicate safety and without a proper entrance sign, an unsafe atmosphere is bound to happen.
Lockout tagout is a safety procedure that ensures machines and equipment are properly shut off during maintenance or repair work.