Mobile communication in a car can be lost when the car passes under an overpass or bridge that has metal

Mobile communication in a car can be lost when the car passes under an overpass or bridge that has metal structures. Explain why this is happening

A flyover or bridge reflects electromagnetic waves.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.