This article may be expanded with text translated from the corresponding article in the Italian Wikipedia. (March 2013)
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Plans to build the remaining stretch have existed for long time, but have never been executed, mostly because of the bad impact on the environment. While a "superstrada" (an almost motorway-like road, with 2 separate carriageways and interchanges) with a speed limit of 110 km/h exists between Rosignano Marittimo and Grosseto, the present road between Grosseto and Civitavecchia has 90 km/h speed limit, with long parts of single carriageway and even some parts of 2-lane road.
The 2 proposed solutions are an entirely new motorway (with higher impact on the environment), and the upgrade to motorway standard of the present road (more environmentally friendly). Lack of agreement between supporters of either idea has led to the present situation.
The road is also known as "Autostrada Azzurra", the Blue Motorway.