Cows block a dirt road in Paraguay.

Dirt road is a common term for unpaved roads made from the native material of the land surface through which they pass, known to highway engineers as subgrade material. A road is an identifiable route, way or path between two or more places. In Highway engineering, subgrade is the native material underneath a constructed pavement Unpaved roads with a harder surface made by the addition of material such as gravel and aggregate (stones), might be referred to as dirt roads in common usage but are distinguished as improved roads by highway engineers. Gravel is rock that is of a specific Particle size range In Geology, gravel is any loose rock that is larger than two millimeters (2mm Aggregate is the component of a Composite material used to resist compressive stress (Improved unpaved roads include gravel roads, laterite roads, murram roads and macadamized roads). A gravel road is a type of unpaved Road surfaced with Gravel that has been brought to the site from a Quarry or Stream bed. Macadam is a type of Road construction pioneered by the Scotsman John Loudon McAdam in around 1820

Compared to a gravel road, a dirt road is not usually graded regularly to produce an enhanced camber to encourage rainwater to drain off the road, and drainage ditches at the sides may be absent. Grading in civil engineering and construction is the work of ensuring a level (or possibly sloped to specific degree base for a construction work such as a foundation or the They are unlikely to have embankments through low-lying areas. To keep a Road or rail line straight and/or flat and where the comparative cost or practicality of alternate solutions (such as diversion is too prohibitive the land over This leads to greater waterlogging and erosion, and after heavy rain the road may be impassable even to off-road vehicles. An off-road vehicle is considered to be any type of Vehicle which is capable of driving on and off paved or Gravel surface

Dirt roads take on different characteristics according to the soils and geology where they pass, and may be sandy, stony, rocky or have a bare earth surface, which could be extremely muddy and slippery when wet, and baked hard when dry. Soil, often typeset as SOiL, is a four piece rock band from Chicago Illinois United States founded by Shaun Glass Tom Schofield Tim King and Adam Zadel Geology (from Greek γη gê, "earth" and λόγος Logos, "speech" lit They are likely to become impassable after rain. They are common in rural areas of many countries, often very narrow and infrequently used, and are also found in metropolitan areas of many developing countries, where they may also be used as major highways and have considerable width. Rural areas can be large and isolated (also referred to as "the country" and/or "the countryside over the course of time A metropolitan area is a large population center consisting of a large Metropolis and its adjacent zone of influence or of more than one closely adjoining neighboring central

Terms similar to dirt road are track, dirt track, and earth road or earth track.

Driving on dirt roads

Detail of a dry, loamy road.

While most gravel roads are all-weather roads and can be used by ordinary cars, dirt roads may only be passable by trucks or four-wheel drive vehicles, especially in bad weather, or on rocky or very sandy sections. A road is an identifiable route, way or path between two or more places. This article is about the semi-truck For the North American use of the word see Pickup truck. Four-wheel drive, 4WD, or 4x4 ("four by four" is a four-wheeled Vehicle with a drivetrain that allows all four Wheels to Vehicles, derived from the Latin word vehiculum, are non-living Means of transport. It is as easy to become bogged in sand as it is in mud, while a high clearance under the vehicle may be required for rocky sections.

Driving on dirt roads requires great attention to variations in the surface and it is easier to lose control than on a gravel road. In addition to the hazards already mentioned, and potholes, ruts and ridges, problems associated with driving on gravel roads include:

• sharper and larger stones cutting and puncturing tyres, or being thrown up by the wheels and damaging the underside, especially puncturing the fuel tank if not shielded
• stones skipping up hitting the car body, lights or windshields when two vehicles pass each other
• dust thrown up from a passing vehicle reducing visibility
• 'washboard' corrugations cause loss of control or damage to vehicle systems such as suspension and steering
• Skidding (loss of traction) on mud after rain. A fuel tank is safe container for flammable liquids and typically part of an Engine system in which the Fuel is stored and propelled (fuel pump or released (pressurized The windshield or windscreen of an Aircraft, Automobile, Bus, Motorcycle, or Tram is the front Window Washboarding is the name in North America of the process which results in roads (particularly Gravel roads or Dirt roads developing a series of regular bumps Suspension is the term given to the system of springs, Shock absorbers and linkages that connects a Vehicle to its Wheels Suspension Steering is the term applied to the collection of components linkages etc