 The road is one of the motorways on the Italian west coast.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.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, but 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.