I remember one time when my Dad yelled at a car. We lived right across the street from a school as it happened, and some kid came roaring by. My dad was standing on the porch, and yelled "SLOW DOWN!" ... the "kid" ( maybe 18 ) heard it and looked querulously, I would say, over at my dad ... but he did slow down!
Circa 1960
Yeah, that’s common. The only problem with that approach is the driver would automatically look towards the sound and take their eyes off the road, possibly missing sight of who’s running out into the street. I’m sure the driver was not traumatized though.