My car was hit by a piece of plasterboard

Today I was on an errand during lunch break. While exiting the highway a piece of plasterboard was blown off the roof from a van in front of me. First it went up but then it came down towards my car. Fortunately it hit my car in the lower part and not at windscreen level. It was a bit scary though. The damage to my car is limited and the insurance of the other party will have to pay for it.