What is this occupation called?

I wouldn't really call it an occupation but those dudes that are on the side walk with ear buds swinging a sign that's a giant arrow saying, "Gary's car wash!" and stuff like that. What's it called?
Ok, I'm not saying this is what I want to be, its for a halloween costume

When I was younger and making my start, my boss would call it "arrow advertising"

Source(s):

I used to spin a sign for Little Ceasers