The A371 runs along the pre-bypass main road through Limavady.
The road starts at a roundabout on the A2 northern bypass. It heads south on a multiplex with the B69, which road soon turns off, after which we bear round to the left and cross the River Roe to enter Limavady. We run along Catherine Street and it's not long before we reach traffic lights and the start of a one-way loop through the town centre.
Eastbound traffic bears left into Linenhall Street, which then bears right into Main Street. The first turn on the right is the pedestrianised Newtown Square, whilst the second turn continues along the loop, although through traffic continues ahead here. The loop heads south then west along Connell Street to pass the police station. At traffic lights we meet Irish Green Street where the loop TOTSOs right to head north (left is the B68) before reaching the other end of the pedestrian area where it turns left into Catherine Street which completes the loop.
Returning to Main Street, the now-two-way A371 continues east past Tesco before following a new alignment between two roundabouts. The unclassified Mill Place heads north from here back to the A2 and is the signposted route avoiding the town centre. Slightly further on, the pre-bypass A2, which we have been following so far, bears left along what is now the B201 and we continue on what was the A37. We head through the eastern suburbs and meet Scroggy Road at a mini-roundabout. It's not long before a T-junction is reached on the current line of the A37 where the A371 ends.