The A3111 is one of the three A-roads on the Scilly Isles, and is the westernmost British classified road. Originally unclassified it gained its number when the island was given classified roads for the first time in the 1960s. The road is narrow and poorly signed, although it does have yellow lines and parking restrictions.
The road starts at a TOTSO on the A3110 at Parting Carn, with the A3111 continuing west along Telegraph Road, which the A3110 has been following from the north. After passing a turn to Porthloo the road passes the Porthmellon Industrial Estate to enter Downderry, a suburb of Hugh Town. It skirts the beach for a short time before bypassing a headland, in which time Church Road turns off to the left; this leads to the A3112 and is marked as an A-road on some maps.
Hugh Street, Hugh Town
The road reaches the coast again and continues west along Strand and then Lower Strand, as it moves further away from the sea itself; buildings now appear between beach and road. The A3112 turns off to the left and the A3111 bears right into Hugh Street, ending at the far end at the entrance to the pier, which links to the ferry terminal. Cars are dissuaded from visiting the Scilly Isles due to their small size and narrowness of the roads and all vehicles are treated as cargo, having to be craned on and off the ship, meaning there is no need for the road to reach the ferry terminal.