In Lydenburg's northern suburbs, the R37 meets the R36 Road and the two routes form one road southwards into the city centre as De Clerq Street, then east as 1st Street, before the R36 becomes its own road southwards at the Viljoen Street junction. The R37 continues eastwards as Voortrekker Street before becoming the Long Tom Pass. As the Long Tom Pass, it goes eastwards for 46 kilometres, as a zig-zag road, to meet the southern terminus of the R532 Road south of the town of Sabie.