Design of Intersection (2)

Posted by Yudha Aditya | 11:29 PM |

Some of the traffic factors to be considered in intersection design are relative speed and manoeuvre areas.

Relative speed is an important factor in traffic flow at grade. Relative speed is the vector difference in the velocities of two vehicles in the same flow and is the sum of the speed of approaching vehicles from opposite direction. It is the speed of convergence of vehicles in separate traffic flows as they approach a point of potential collision. Relative speed is dependent on the absolute speeds of the intersecting vehicles and the angel between them. When the angle of merging the relative speed will also be low. If there is a collision between two vehicles at small angle at about the same speed or at low relative speed, the impact will be much less than when vehicles collide at high relative speed.

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Manoeuvre areas are those areas where, in actual manoeuvre, there is a potential collision and also those like channels of approach and departure where the manoeuvre is influenced.

Elemental manouvre areas are those formed by only two single oneway lanes of flow when they diverge, merge or cross, these being the simplest of these manoeuvres. But in multiple manoeuvre area where more than two one-lane one-way flows are present traffic operations are much more complex and hence are to be avoided in intersection design.

Highway and Transport Engineering
and this section is about Design of intersection
(refference : Khanna, S.K., Justo, C.E.G., Highway Engineering, 3th edition, Nem Chand & Bros Roorkee (U.P.), 1976.)

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Title Post: Design of Intersection (2)
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Author: Yudha Aditya