answer the two questions

Overview

https://www.forconstructionpros.com/asphalt/articl...

https://www.constructconnect.com/blog/10-road-cons...

https://www.dbkrieginc.com/onsite-work-safety.php

https://www.cdc.gov/niosh/topics/highwayworkzones/...

https://www.cdc.gov/niosh/topics/highwayworkzones/...

https://safety.fhwa.dot.gov/wz/resources/fhwasa030...