The road measures 9.34 miles long and would take a car obeying speed limits 17 minutes to travel its length.
The B4242 is a B Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like Aberdulais, Clyne, Abergarwed, Resolven, Cwmgwrach, Pont Nedd Fechan, and Glynneath.
The road is located entirely within West Glamorgan.