From Wikipedia: https://en.wikipedia.org/wiki/Orthotropic_deck
An orthotropic bridge or orthotropic deck is one whose deck typically comprises a structural steel deck plate stiffened either longitudinally or transversely, or in both directions. This allows the deck both to directly bear vehicular loads and to contribute to the bridge structure's overall load-bearing behavior.
A list of all known as built in the US 1960-2003: http://www.orthotropic-bridge.org/2004BridgePages/Pages/USA....
ASCE site: http://www.orthotropic-bridge.org/