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It is called Ronda del Mig on the expressway that runs through the city of Barcelona through the interior of the city, unlike the Ronda del Litoral and the Ronda de Dalt, which run through the periphery. It was originally called the "First Round Belt" It was initially planned in the Barcelona link plan of 1907, the work of the Tolosan town planner Léon Jaussely, although its execution, with important modifications, lasted almost the entire 20th century. In the planning of the City council in the decade of 1970, its continuity from the Guinardó was anticipated, where it finishes at the moment, until the sea, happening through the Sagrera and the present Rambla Prim. The roundabout is partially buried between Plaça d'Ildefons Cerdà until the junction with Via Augusta, a section that can be traveled without stopping at any traffic light, as well as a small section between Travessera de Dalt and Ronda del Guinardó (between Carrer de l'Escorial and Plaça d'Alfons X el Savi, confluence of Pi i Margall and Prague streets). In addition, the roundabout has an underground passage under Avinguda Diagonal and Plaça de Lesseps. The vegetation on the underground sections consists of different tree species such as false pepper (Schinus molle), tipuanas (Tipuana tipo), xicandres (Jacaranda mimossifolia), hawthorns (Celtis australis), washingtonias (Washingtonia robusta and W. filifera), datiler (Phoenix dactylifera), etc. More information in The Atlas of Biodiversity

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