Photos and videos have surfaced showing drivers stopping their vehicles under an overpass, to prevent hail damage.
This is not a safe practice for several reasons.
The main reason is that it creates a hazard to other drivers. If you choose to stop, you should do so on the side of the road.
Although it might seem like the bridge over your head would protect you during a tornado, hiding under an overpass or bridge is very dangerous, because a tornado's winds can blast debris underneath the structure.