|Distance:||37.2 miles (59.9 km)|
|Meets:||B8001, B879, A83, B843, unclassified|
|Former Number(s):||A83, A818|
|Route outline (key)|
The B842 is a long B-road down the eastern side of Kintyre almost to the southern end. As such it is the southernmost classified road in the 8 zone.
The road commences at a junction with the B8001 where that road TOTSOs near to Claonaig ferry terminal. From here it heads in a south-westerly direction through the townships of Crossaig, Cour and Grogport to Carradale; this part of the route is single-track until just north of Carradale and has a number of narrow bridges, tight bends and steep hills, the most formidable being at Grogport. Although this is the coast road, the sea is always some distance away (but usually visible), except at Grogport where the road does meet the beach, after which the road follows a more westerly route through the hills and the sea is no longer visible.
At Carradale the road meets the B879, which heads east to the pier. From here the B842 heads south and quickly returns to the coast, although again the sea is not always visible. It passes through the townships of Bridgend, Torrisdale, Saddell, Ugadale, Ballochgair, and Peninver, before entering Campbeltown as High Askomill Road and then High Street. The route TOTSOs left into Saddell Street which turns into Lochend Street which reaches a T-junction on the A83. It turns left to multiplex with the A83 as Longrow. At the end of Longrow is a T-junction where the A83 ends and the B842 turns in both directions. There is a spur to the left along Main Street to end at a roundabout by the pier. The mainline turns right, also onto Main Street, turning right again as Lorne Street, then Big Kiln Street, then Witchburn Road before leaving Campbeltown behind.
At the village of Stewarton the B842 meets the B843 and TOTSOs left. The road continues to the south through farmland and then follows the course of Conieglen Water to the village of Southend. The road ends here at an arbitrary point on the main street. From here the road continues further as an unclassified route from where it is possible to reach the Mull of Kintyre lighthouse.
Originally the B842 started at Stewarton, where it also met the A83 and B843, before heading south to Southend. The road was soon extended north via a multiplex along the A83 into Campbeltown and then along its present route to the B8001.
Some time after 1975 the road between Campbeltown and Stewarton ceased to be the A83 and was naturally renumbered as the B842. The road to the pier still had Class I status; this could have been the A83 or its original number, A818 - but in more recent years that road has also been downgraded to give the B842 a spur.