The Intersection At Transport Engineering
This article is about highway and transport engineering, this time we talk about The Intersection
The existing system of streets and highways functions with most complex set of interrelationships. The operating characteristics of this system are functionally dependent upon the number and kinds of users that require service. This is particularly true at those points where elements of the system come together the intersection. When traffic volumes increase or change their nature, e.g., an increase in the number of trucks and/or buses, it is usually the intersection that first proves itself incapable of serving the added or altered demand. This is most frequently illustrated by increased congestion and delays, and a worsening accident experience. That this occurs is logical, since the intersection is a concentrated conflict point which generally functions at a lower capacity and level of service than any of the road segments it serves.
When it becomes evident that an intersection has, in fact, become a bottleneck to the satisfactory operation of the adjacent highway system, a detailed study of its physical and operational capabilities and limitations must be made. Based upon that study, appropriate decisions can be made as to the nature and degree of improvement possible or justified.
When dealing with such intersection or other limited area modifications, it is common to refer to them as “point” or “spot” improvements. Spot improvements fall into two general classes: minor (limited), and major (extensive). Minor spot improvements usually are those that can be accomplished within the existing right of way, and at relatively low cost. Examples of such minor improvements include the installation of traffic control devices, channelization, right and/or left turn lanes, parking controls, and roadway illumination. Major spot improvements generally require the purchase of additional right of way, and the expenditure of sizable sums of money. Examples of major spot improvements include vehicular and pedestrian grade separations, intersection reconstruction, including widening and straightening of approaches, and purchase of right of way to improve sight distance
(source : traffic transport engineering theory and practice by louis j.pignataro)
When it becomes evident that an intersection has, in fact, become a bottleneck to the satisfactory operation of the adjacent highway system, a detailed study of its physical and operational capabilities and limitations must be made. Based upon that study, appropriate decisions can be made as to the nature and degree of improvement possible or justified.
When dealing with such intersection or other limited area modifications, it is common to refer to them as “point” or “spot” improvements. Spot improvements fall into two general classes: minor (limited), and major (extensive). Minor spot improvements usually are those that can be accomplished within the existing right of way, and at relatively low cost. Examples of such minor improvements include the installation of traffic control devices, channelization, right and/or left turn lanes, parking controls, and roadway illumination. Major spot improvements generally require the purchase of additional right of way, and the expenditure of sizable sums of money. Examples of major spot improvements include vehicular and pedestrian grade separations, intersection reconstruction, including widening and straightening of approaches, and purchase of right of way to improve sight distance
(source : traffic transport engineering theory and practice by louis j.pignataro)
Title Post: The Intersection At Transport Engineering
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Rating: 100% based on 99998 ratings. 5 user reviews.
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