The Marquam Bridge located in Portland, in the state of Oregon was built in 1966. It is characterized by highways running on two levels over the Wilamette river. The data says that 3 years ago there were 140 thousand vehicles driving through the bridge every day. Today it is estimated that the number of cars has grown up to 180 thousand vehicles a day. The bird-eye view of the city is often represented by plenty of vehicles, buildings, factories and roads network. The mighty bridges rising over the waters seem to be monumental.