Simplify the following text for a Grade 12 native English-speaking person.
Original: A transport network , or transportation network in American English , is typically a network of roads , streets , pipes , aqueducts , power lines , or nearly any structure which permits either vehicular movement or flow of some commodity .
Simplified: A transport network , or transportation network is a network of roads , streets , pipes , power lines , or any structure that lets either movement of vehicles or flow of some commodity .