Not exactly. The metal roof and metal sides of a vehicle somewhat protects a person from lightning. It is not the vehicle tires, but instead the conductive quality of the frame that diverts the lightning energy to the ground. The car acts like a faraday cage. Because fiberglass is a poor conductor of electricity, vehicles made with this material are not as safe. A metal shelled vehicle does provide protection; however, the best safety measure during a severe thunderstorm is to park under a bridge or seek shelter inside.