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A Curve in the Road

A Curve in the Road

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In the case of horizontal as well as vertical, road curves should ensure safety, comfort, and convenience for traffic, while they are further classified as follows: 1.Simple Curve:

These curves gives a gradual change in grade or slope that provides a sufficient comfort to the passengers. 1.Summit Curve: Is a curve with a gradual change in elevation on the outside of the curve to help drivers comfortably take turns at faster speeds Sag vertical curves are those that have a tangent slope at the end of the curve that is higher than that of the beginning of the curve. When driving on a road, a sag curve would appear as a valley, with the vehicle first going downhill before reaching the bottom of the curve and continuing uphill or level. Curves are regular bends provided in the lines of communication like roads, railways, and canals to bring about a gradual change of direction. A compound curve has two or more simple curves with different radii that bend the same way and are on the same side of a common tangent. In this diagram, MN is the common tangent.

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In the compound curve, the two adjoining curves may have a common tangent and the centers of the two adjoining curves might be positioned on the identical side of the curve. A curve with a series of two more simple curves of different radii in the same direction is called a compound curve. Find sources: "Road curve"– news · newspapers · books · scholar · JSTOR ( November 2018) ( Learn how and when to remove this template message)

A simple curve has the same radius throughout and is a single arc of a circle, with two tangents meeting at the intersection (B in this diagram). The profile of a road consists of road slopes, called grades, connected by parabolic vertical curves. Vertical curves are used to provide a gradual change from one road slope to another, so that vehicles may smoothly navigate grade changes as they travel. The Autovía del Olivar which unites Úbeda with Estepa in Andalucia in southern Spain. A geometric design saved on construction costs and improved visibility with the intention to reduce the likelihood of traffic incidents A curve in which the radius gradually varies from infinity to a finite value that is equal to a circular curve and vice versa is called the transition curve. Crest vertical curves are curves which, when viewed from the side, are convex upwards. This includes vertical curves at hill crests, but it also includes locations where an uphill grade becomes less steep, or a downhill grade becomes steeper.

Within the straight route, gradients are made extra comfortable and easy by offering diversions with the help of curves. Sag vertical curves are curves which, when viewed from the side, are concave upwards. This includes vertical curves at valley bottoms, but it also includes locations where an uphill grade becomes steeper, or a downhill grade becomes less steep.They enable the vehicle to pass from one path to another when the two paths meet at an angle, curves provided within the vertical plane at all changes of grade to avoid the abrupt change of grade on the apex. A curve in which there is an arc of a circle with two straight tangents join and bring a deflection of the road through an angle is called a simple curve. In a straight route, if costly land comes in the way, then it can be avoided by providing diversions with the help of curves. Therefore, it must be properly studied and designed, so that safety, comfort and convenience can be provided or accidents can be reduced while driving vehicles.



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