It actually has nothing to do with proximity to moving traffic! If you're a gentleman, be prepared to take some shit from a stranger on your girl's behalf
HEY BABE YOU SHOULDN'T WALK THAT SIDE; IF A CAR WAS TO COME AT US, IT WOULD HIT ME FIRST; OH MY GOD ,HE'S SO ROMANTIC; GOOD SHE HASN'T SEEN THE BEGGAR WITH THE KNIFE