|Length:||2 miles (3.2 km)|
|Met (1934):||A3082, A390|
|Now part of:||A3082|
|Route outline (key)|
The original A3084 was a road in south Cornwall, short in length and time of existence. It was originally the westernmost section of the B3271. It survived becoming the A3082 along with the remainder of that road around 1930 although it gained its own number, A3084, in the early 1930s then became part of the A3082 after all in 1935.
The road started on the A3082 TOTSO in the centre of Par. It headed south to pass under the main railway line twice in fairly quick succession before turning westwards and heading across open country to end on the A390 at Holmbush, between St Austell and St Blazey.