The Dalby–Cooyar Road commences at an intersection with the
Bunya Highway (State Route 49) in . It leaves Dalby as Irvingdale Road and runs east, soon becoming Dalby–Cooyar Road. It turns north-east and reaches the eastern boundary of Dalby, where it passes the exit to Dalby–Nungil Road and turns north, passing between Dalby and before turning north-east and running through from south to east. In Kaimkillenbun village it passes the exit to Bell–Kaimkillenbun Road and turns east. At the eastern boundary of Kaimkillenbun it passes the exit to
Bunya Mountains Road and enters , which it runs through from west to east, passing the exit to Bowenville–Moola Road. It then runs between and for a short distance before passing the exit to
Pechey–Maclagan Road and turning north-east into Maclagan. In Maclagan village
Bunya Mountains–Maclagan Road exits to the west and then turns north. Dalby–Cooyar Road continues north-east through Maclagan until it nears the eastern boundary, where it turns east and enters . The road ends at an intersection with
Oakey–Cooyar Road (State Route 68) in Nutgrove. Land use along this road is mainly crop farming. This road is part of a
network that enables access to the locality of Bunya Mountains from three lowland points, thus providing alternatives in case of flooding, other natural disasters, or planned maintenance. ==Internal roads==