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Dirt roads almost always form a washboard-like surface with ridges. The reason for this is that dirt roads have tiny irregularities; a wheel hitting a bump pushes it forward, making it bigger, while a wheel pushing over a bump pushes dirt into the next bump. However, the surface can remain flat for velocities less than 5 mph (8 km/h). [2]
In modern roads the main cause is heavily loaded trucks. These heavy loaded trucks imprint their tire impressions on roads over time, causing ruts. Rut is a common pavement distress and is often used in pavement performance modeling. [1] Ruts prevent rainwater from flowing to the side of the road into ditches or gutters.
A primitive road near Dayton, Washington, United States. A primitive road is a minor road system, used for travel or transportation that is generally not maintained or paved. [1] Primitive roads primarily occur in rural farmlands, deserts, or forests rather than in developed areas.
Marohn distinguishes between roads that are designed for mobility which he terms "roads" and those that function to "build a place", build community wealth and provide access to land. He argues the value of a road in terms of both community wealth and mobility is maximised when the road speed is either low or high, but not at midpoints such as ...
This is a list of highways or other major roads around the world. International highways are listed first; after that, roads are listed by continent, and then by ...
Charlotte Motor Speedway Dirt Track: Dirt track Charlotte, North Carolina: 2016: 1 2 TORC: The Off-Road Championship: Circuit of the Americas: Mixed surface (X Games), road course (IndyCar) Austin, Texas: 2014–2015, 2019: 3 4 X Games, IndyCar Classic: Crandon International Off-Road Raceway: Off-road Crandon, Wisconsin: 2013: 1 2 TORC: The Off ...
Fire engine, fire truck, or fire lorry A road vehicle (usually a truck) that functions as a firefighting apparatus. Flagger or flagman. See traffic guard. Freeway. See controlled-access highway. Frontage road, access road, service road, or parallel road A local road running parallel to a higher-speed, limited-access road.
This is a list of notable mainland settlements that are inaccessible from the outside by automotive roads (roads built to carry civilian passenger motor vehicles). These settlements may have internal roads or paths but they lack roads connecting them to other places.