Honestly, the roads would probably be an improvement on some of the local ones...

I love that drawing because everyone is doing someone roman-road-building related, but none of it makes sense in context.

A man is holding a Groma, but there are no right angles or straight lines to be measured here, the road is basically already done. And even if there were, he's just kinda leaning on it.

A fully armored legionnaire is standing right in the middle of the construction site. Guarding the gravel, one presumes? He's also right on the edge, about to damage the tamped rocks.

A man is setting stones, which is very hard and backbreaking work. These must be some really light stones, since he's opting to lift them all the way to a standing position.

Someone is pouring gravel from high enough that the guy kneeling below is absolutely getting pummeled by bouncing rocks.

The containment stones seem to be placed on top of the 2nd layer, making sure they don't actually contain anything.

And the horses.

One riding along that road in the background, for some reason the wagon wheel is turned directly towards the viewer.

The other wagon carrying some sort of goods, originating from the road that fades to nothing.

And the horse that is calmly walking with its front legs while it's rear legs are both airborne, suggesting a gallop?

Oh also the person carrying a load of stones from a spot the road will be built to. Though maybe that was a part of the process if they layered different materials underneath the road, but it looks a bit deep to me.

Edit: Oops meant to reply to the other comment about the workers. Instead, this is the timeline I inadvertently chose. Hopefully it's a good one.