da roma est a fiumicino passando per la ciclabile Regina Ciclorum

http://brouter.de/brouter-web/#map=13/41.7924/12.4144/standard&lonlats=12.567997,41.86038;12.435321,41.825101;12.428026,41.831777;12.415174,41.808849;12.411423,41.801736;12.384263,41.799915;12.36618,41.805734;12.349685,41.805886;12.343988,41.808637;12.342297,41.816963;12.341015,41.800256;12.337922,41.797249;12.306664,41.798638;12.29854,41.792527;12.284854,41.788976;12.276386,41.775482;12.228919,41.771214;12.284303,41.74074

la parte complicata sembra ponte di mezzocammino + sottopasso per superare il GRA