How do the construction sites keep the dirt from getting in people's lungs?

The trucks coming in and out some construction sites all day long, track the dirt out into the street, and the passing cars buses, trucks, put the thick dust out there in the air.
How do the some construction sites keep the dirt from ending up in the street -> lungs of passersbys’, (drivers idling in traffic, pedestrians), lungs etc. other than watering the entrance and the surrounding area to the site?