|Original name||Ponte Luís I|
|Longest span||172 m|
Luís I Bridge is an arch bridge that crosses the river Douro in Porto, Portugal.
Construction of the bridge started in 1881 and the bridge was opened in 1886. When the bridge opened with a span of 172 meters, it was the largest arch bridge in the world until 1898.
In the upper deck go all metro and the lower deck is car traffic.