I took a closer look and saw those curbs.

I can imagine the pain...

If I recall correctly, on my only ride outside of the city I had choice between this kind of dirt road and the main road conquered by trucks, and after riding few meters on the dirt road, I went back to to main road.

But the dirt roads in the village that I go regularly, are fun to ride (when it's downhill). They're soft and smooth. though it's such a struggle to go uphill. A fair game anyway, you try hard for 30 minutes to have a five minute full of action and fun.