The Vrijenbergerspreng gravel road runs next to the Vrijenbergerspreng (it's all in the name ;-)).
A spreng is a dug out natural water source on the Veluwe. The source itself is more to the east (you'll need to cross the N-road for that) and runs to the channel it feeds in the west. The gravel road is doable for road racers, but you'll need to be somewhat of a daredevil with a big love for gravel to actually ride this road on your racer. Although it looks like a hardpack Strade Bianche, the surface is often loose with little rocks or sandy. Keeping your eyes on the road here is a smart idea. The places this road take you however are worth the trouble. Not only is it a nice road through the forest, but it will also pass by some nice little waterfalls, including the largest waterfall in the Netherlands!!! Don't jump of your chair just yet... it's next to nothing, but it's everything we have ;-)