And if you need to get their attention?
"Hello, head over behind the yellow line."
"Hello, head over behind the yellow line."
"HELLO, head over behind the yellow line."
"HELLO!! HELLO!! OVER HERE. PLEASE HEAD OVER BEHIND THE YELLOW LINE!"
"What, you talking to us?"
Social phrases like: "sir, ma'am, friend, pal, chief, guys, son, mister, miss, etc..." are used to establish a social link to give a direction, or ask a question. Seems odd to just start suddenly talk to someone not paying full attention to you.