"mud road" is a correct and usable phrase in written English.
You can use it anytime you want to refer to a road made of mud. For example, "We took the muddy back roads to get to the camp site."
We were creeping along a mud road just outside Monrovia, where the city gives way swiftly to villages and bush.
Wheel wells that were open traps for water, mud, road salt and other corrosive materials are now panel-covered.
I hopped in his truck for a half-hour drive to the Alakai Wilderness Preserve, a bumpy ride down a mud road.
His group wheezed its way up the steep mud road to the cemetery, stepping over jagged rocks and avoiding yawning ruts.
Earlier in the week, on a mud road in a plain in the middle of nowhere, we came across three boys pulling honeycombed chunks of cardboard.
The mud road to the nearest town is so primitive that even four-wheel-drive trucks get bogged down in the rainy season.
This time, when the sun set, the mud roads were clear.
PLAN TRES MIL is a neighbourhood on the outskirts of Santa Cruz, made up of mud roads and outdoor markets.
The mud roads were still sticky with blood, and children carefully tiptoed around the broken sticks tipped in red.
The small motorcade arrived along potted mud roads and past single-storey peasant homes and pulled up in the village of Parcani, near Moldova's northern border with Ukraine.
Even in the more central ger areas, where many residents have lived for over a decade and built more permanent wooden or brick houses, running water and central heating are unavailable and the streets remain dark, mud roads with open sewage streams and rubbish piled high.
