At the front of the vehicle sit the first round of spouts, which wet the road and debris. “That's to prevent dust,” explained Hess. “It allows the dirt and debris to be compacted down to then be better swept toward the head.” Then behind the front wheels of the truck sit the two broom heads.
How do you use an angle broom?
https://www.youtube.com/watch?v=YCtkS3PN_G8
What is a sweeper tractor?
Sweepster front-mounted angle sweepers for utility tractors. Models range from 5 feet to 9 feet sweeping widths. They are very good brooms for snow removal, heavy duty cleanup and millings.