n34s
From a web search (sources: https://www.federciclismo.it ; https://mountainbike.federciclismo.it ; https://www.facebook.com/BikeTeamBucchianico/ ; https://www.facebook.com/angelo.donofrio ; http://biketeambucchianico.blogspot.com/ ; https://www.chietitoday.it ; http://www.ruoteamatoriali.it ; https://www.pianetamountainbike.it ; https://www.occhiuzzitag.it ) it appears that the latest edition of "Granfondo San Camillo De Lellis" ran on May 8 2016 (race ID: 124479: https://www.federciclismo.it/it/race/gran-fondo-san-camillo-de-lellis/124479/). The "Granfondo San Camillo De Lellis" is not in the Abruzzo Mtb Cup calendar ever since. The other 3 editions of the race were held on the following dates: October 4 2015 (race ID: 90628: https://www.federciclismo.it/it/race/gran-fondo-san-camillo-de-lellis/90628/); 6 July 2014 (advertised as "Marathon San Camillo De Lellis"; race ID: 53981: https://www.federciclismo.it/it/race/gran-fondo-san-camillo-de-lellis/53981/); 22 September 2013 (race ID: 51476: https://www.federciclismo.it/it/race/gran-fondo-san-camillo-de-lellis/51476/). Basically, this track has not been used for over 5 years for an officially recognized FCI mtb competition. This plus the neglect due to time and the regrowth of surrounding vegetation means that this track has mostly fallen into disuse. It's good that way 320081503 is now avoided by all OSRM routing profiles. Also from here you can have an account of how the path actually looks: https://it.wikiloc.com/percorsi-mountain-bike/villamagna-calcara-di-san-camillo-viadotti-di-bucchianico-palude-84193172. "fully covered with shrubs and brambles". Since unfortunately OSM doesn't allow to make a real distinction between types of bicycles and pedestrians I propose to change the name of way 320081503 to "Gran Fondo San Camillo *tratto con arbusti e rovi" in order to help users by at least putting them in condition of being able to evaluate better options in planning their own route as well as increasing safety.