At the junction, which is marked by huge cypress trees, follow signs for Buonconvento/Bibbiano, crossing the junction for the fortress of Castelnuovo Tancredi, and you will arrive in Bibbiano. From here you should turn left towards Buonconvento on the SP 34/c ‘Murlo’ road.
Head downhill, and after 1.4km, at the bottom of the hill, turn left again onto a dirt road. Continue along this track to La Piana, which crosses part of the Eroica route: the first 4km are flat, then there is a gentle hill of 1.5km before you rejoin the SP 34/c-d road, where you should turn right towards Murlo. After 4km you will be back where you started.
Once you're back in Murlo, make sure you pay a visit to the Antiquarium di Poggio Civitate museum, hosted within the premises of the old episcopal residence in Murlo. Fun fact, from the windows of the museum it is possible to admire the Poggio Civitate and Poggio Aguzzo hills in all their grandeur. Such hills are of prominent importance in the understanding of the Etruscan civilization, as excavations in the area have brought to light the extraordinary findings that are kept in the Antiquarium.