Keep Aisles Clear - Safety First Sign. Use these safety first signs as a constant reminder regarding your vital safety policies. Show employees you care about their safety and remind everyone about safety policies throughout the workplace. Complies With AS1319:1994 Keep Aisles Clear - Safety First Sign Use these safety first signs as a constant reminder regarding your vital safety policies. Show employees you care about their safety and remind everyone about safety policies throughout the workplace. Display important information and ensure they will be seen all the time to prevent accidents. Complies With AS1319:1994.