The video below From: YouTube user joesailor8 shows from the point of view that there is a lot going on around the driver. You can here a lady say I am not moving my fffnnn car. Right there is a Neighbor voicing her jealousy about a bigger house going up to close to theres. This happens all the time. She said she would not move her car. If that is her daugther running out between the truck and all you hear is the a male saying did you see that she allmost fell that was his main concern. He should be telling her not to do it but watch the ending as she runs back before the truck is done amazing.
This is why you need to keep the music low as you roll as I say. You can here someone say why don't he hurry up already and just do it. The driver wants to go slow so that when peoples kids run under a tire while they are filming and complaining about the car that they wont move and the kid they wont control. There is time for a spotter to grab the drivers attention or the driver to notice at a lower speeds.
The video below is cement truck doing his job as people get in his way