Why do dragonflies hover over cars?

Yes, they (usually female dragonflies) likely perceive the highly reflective and polarized coating on the car as the surface of water. If you watch, you may see the dragonfly repeatedly poke the tip of its abdomen to the surface. It is trying to deposit eggs. read more

Dragonflies, actually all Odonata will hover over the surface of the water waiting for emerging midges and mosquitos which are their favorite prey, so the behaviour you are observing is based on a feeding behaviour. read more

However, if you are in an area where there is a lot of dragonfly activity and you repeatedly have problems with dragonflies laying eggs on your car (they’ll be visible as little yellow streaks or blobs), this is a surefire way to keep the dragonflies off your car’s finish. read more