Hallway Width

[mtlogcabin]

But considering there is a men's door in the aisle both closer and latch that would mean there has to be 48" minimum hallway width.

You are correct. If there is no latch on the bathroom door then 44" is the minimum required.
If you have a closure and a latch on the exit door then you will be back to 48" again for the minimum width at the exit door and for the 48" in front of the door

 

[orlando77]

So if the back door is not available as a customer exit, then it becomes a dead end corridor … right?

The back door is required to meet the 2 exit access requirement 1015.1. The customers will not park behind the building because it's a service road. If there is a fire then they can exit the back door if needed. The back door will be unlocked at all times during business hours.

 

[e hilton]

The back door is required to meet the 2 exit access requirement 1015.1.

If the door is a required exit, it has to meet clearance requirements. 32” min clear width.

 

[ADAguy]

excellent points