Simple, get some blue collar work outfit like an overall with a commercial looking brand on it.
Forge a letter that you are on your way to your job site with a business stamp or signiture.
Facility maintanance, construction, sewage works, whatever, be creative.
It just has to be considered "essential".
Authorities usually don't care if you are dresses like a blue collar worker and have some piece of paper with a comercial apearence from a legitimate business.
People ussually only see, what they want to see.
When a cop sees someone in an overall with tools and a paper with a business stamp on it, he just assumes that you are what he sees in front of him.
That works pretty much everywhere, heck you could even access most wharehouses if you just dress like you belong.
Noboy looks twice, you are what people see in front of them.