Huge bolete fungus – one of the caps was over a foot in diameter.
Boletes are fleshy mushrooms that have pores on the underside of their caps rather than gills.
They may have been ceps (also known as penny buns, Steinpiltz), a wild mushroom favoured by gourmets. If so, these should still have been avoided. They were growing on an island in the middle of a busy road. Fungi concentrate any pollutants in the environment where they are growing.
Boletus edulis. Edible and choice. (Pfft, Forget your unfounded polution fear)