I received a email from an employee stating that he almost knocked over another employee over coming thru the warehouse doors. The employee thinks that because the warehouse doors don't have any windows in them that it is a safety issue because you can't see people coming in or out.

Would this be a safety issue? We have been in this building for over 7 years and have not had any issues with the warehouse doors. Would we need to consider having doors with windows installed for the employees that access them?