Leaving Ajaccio follow the signs Propriano-Sartène-Bonifacio on the RN193  then  take the N196 until Pisciatella.
Turn right on to the D302 (Clos Capitoro).
Drive about 10 minutes then turn right on to the D255
to Pietrosella then turn right on to the D55 up to the Col de Gradello.
Take the D355 and turn left to Serra di Ferro then take the D155 to
Porto-Pollo.

Have a nice drive!