The Dohlaran Royal High Roads were designed, built, and maintained by the Kingdom of Dohlar. They had hard and smooth surfaces, made up of multiple layers of tramped gravel rolled out and then covered with slabs of cement.  Much like the Roman roads of Old Earth they allowed fo quite transportation of people and goods under most weather conditions.

The Caravan of Inquisition made extensive use of the roads on the way to the Temple Lands. (HFAF)