Stores with Entrance on the Wrong Side

I get annoyed with stores that have their entrance and exit doors on the wrong side. Is it or is it not customary that you enter on the right and exit on the left... or am I simply insane? - L.W.

Enter left, right, out
It must be opposite day
In through the out door

When Exit Sign B Precedes Exit Sign A

On the interstate where there are multiple exits why does the B exit come before the A exit? -L.M.

When I'm driving your letters throw me off course
An alphabetical cart before the horse
B should follow A
Mark exits that way
Your backwards code is more confusing than Morse