[1] The road forms two junctions to D38 state road, one in Brestovac, where D38 branches off to Pakrac, and another 5 km (3.1 mi) further east, in Požega, where D38 branches off to Pleternica.

The eastern terminus of the road is near Gradište, at a junction to D53 state road to Našice (to the north) and Slavonski Brod (to the south).

[2] The route comprises numerous junctions to county and local roads, as well as a significant number of urban intersections, in segment of the road running through Požega.

[3] The D51 state road currently serves as the principal connection of the city o Požega and the A3 motorway, however there are plans to replace it with a new expressway, that is expected to comprise a significantly altered route.

[4] Traffic is regularly counted and reported by Hrvatske ceste, operator of the road.