Is there a problem with Aisle? You're starting to move into bureaucratic language (although it's all right if you want it).
Before we can answer, I think you need to consider why a sign is being put up at all (most employees will already be familiar with how this aisle fits into warehouse life).
So, are you putting up a sign because of
government regulations, or
because it's a busy aisle and you want to warn people, or
someone's already been run over with a forklift and your insurance company insists, or
you just think it will look good -- more organized, more corporate?
Figuring out what it's for will help you decide what to say.
As state regulations required, signs are for employees, especial for new employees and vistors. For instance, if there were some emergency cases happened, new employees could find the right things in a short time. If the vistors come to the workshop or a warehouse, they can see it directly and know all things are well organized, and moreover, it can help employees work more effectively