Windshield damage problem

We operate a media production company in Western Canada where we travel to our client sites to do video shooting and photography. During the winter, the windshields on our vehicles suffer rock chips and cracks because of gravel used for traction on the roads and highways. Replacing windshields each spring is not the solution. We need a method to prevent the windshield damage before it happens. Some of our clients operate large fleets. If we can find a solution that works for us, we would be interested in recommending it to them as well.

Region: Western Canada