sort of "shuttle tram" for tourists between Sagrada Família and La Pedrera, while the other one would mostly pass through Gran Via. However, this was never realised, with Trambaix and Trambesòs remaining unconnected upon the departure of Trias' government in 2015. The incumbent mayor, Ada Colau, has continued promoting the connection of the TRAM along the Avinguda Diagonal, however was defeated by opposition parties when she presented the proposal to the city council in 2018. Other projects The Infrastructure Master Plan (PDI) 2011–2020 by the Autoritat del Transport Metropolità (ATM) for Barcelona metropolitan area includes various proposals to extend the existing tram network. In general, it is about extension projects on existing routes following major arterial corridors and with a completion of projects beyond 2020. Estació de Sant Adrià ↔ Port de Badalona: The expansion of route T4 from Sant Adrià de Besòs railway station towards Badalona will comprise the construction of 3 new stops, 1.7 km of tracks along Eduard Maristany Avenue and the purchase of a new tramcar. It is meant to serve Badalona's coastal strip and gain more than 3,000 new passengers, 270 of which from the private car. That new section has an estimated cost of €22 million and is expected to be further extended to reach Badalona railway station in a future. Ciutadella Vila Olímpica ↔ World Trade Center: It is expected to give continuity to the current southern terminus of route T4 situated at Ciutadella – Vila Olímpica stop with that extension project. The new suggested route would surround Parc de la Ciutadella passing through the nearest side to the sea, and then it would follow Barcelona's coastal strip up to the waterfront where World Trade Center Barcelona is located, serving the Port Vell area included in the Barcelona Seaport complex. Auditori Teatre Nacional ↔ Plaça Urquinaona: This enlargement is proposed as an extension of route T5 towards Barcelona city centre that starts near Auditori – Teatre Nacional stop up to Plaça Urquinaona, passing through the arterial corridors of Vilanova Avenue and Ronda de Sant Pere. Torribera ↔ Sant Adrià: Although this project does not appear in the updated PDI 2011–2020, it has been proposed by the Sant Coloma de Gramenet City Council and appeared on PDI 2010–2018 which was drawn up by the former government of the Generalitat of Catalonia and the ATM. The project involves the construction of a new tram line