Driving behind vans without actual mud flaps increases the probability of windshield chips from unfastened gravel and highway debris.

https://foxtrot-wiki.win/index.php/After_Your_Windshield_Replacement:_Dos_and_Don%E2%80%99ts

Driving in the back of trucks with out appropriate dust flaps will increase the possibility of windshield chips from loose gravel and avenue debris.