What is Dom Luís I Bridge?
{{Infobox bridge |name=Dom Luís I Bridge |native_name=''Ponte de Dom Luís I'' |native_name_lang=PT |image=File:Puente Don Luis I, Oporto, Portugal, 2012-05-09, DD 13.JPG |image_upright= |alt= |caption= |coordinates={{coord|41.139863|N|8.609336|W|display=inline,title}} |os_grid_reference= |carries=[[Light rail]] line and pedestrians (upper deck)<br>General traffic and pedestrians (lower deck) |crosses=[[Douro River|Rio Douro]] |locale=[[Metropolitan Area of Porto|Porto]], between the [[Porto|City of Porto]] proper and [[Vila Nova de Gaia]] |official_name=Ponte de D. Luís |other_name= |named_for= |owner= |maint= |heritage='''Property of Public Interest'''<br>''Imóvel de Interesse Público''; Decree 28/82, Diário da República, Série 1, 47 (26 February 1982); Included in the Historic Centre of the City of Porto (PT011312140163) and partially included in the Historic Zone of the City of Porto (PT011312070086) |id_type=SIPA Identification |website= |preceded=Ponte Pênsil |followed= |design=Two-hinged double-deck [[arch bridge]] |material=Iron |material1=Granite |material2=Asphalt|length=Two decks of varying lengths: {{convert|172|m|ft}} (lower deck) and {{convert|395.25|m|ft}} |width={{convert|8|m|ft}} vehicular width (between pedestrian walkways) |height={{convert|45|m|ft}}{{citation needed|date=March 2022}} |depth= |traversable= |towpath= |mainspan={{convert|395.25|m|ft}} |number_spans= |piers_in_water= |load=|clearance_above= |clearance_below= |lanes= |life= |num_track= |track_gauge= |structure_gauge= |electrification= |architect= |designer=[[Théophile Seyrig]] |winner=|contracted_designer= |engineering= |builder=Société Willebreck |fabricator= |begin=21 November 1881 |complete=30 October 1886 |cost=369,000$00 [[Portuguese real|réis]]<ref>{{citation | url = http://paginas.fe.up.pt/~azr/pontes/techdata.htm | title = The Bridges of Porto - Technical Data | author = Manuel de Azeredo | publisher = Faculty of Engineering, University of Porto | date = December 1999 | access-date = 12 August 2014 }}</ref> |open=<!-- or | o