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Roads: Geometric design and layout planning

Roads: Geometric design andlayout planningChapter 77 TABLE OF CONTENTSSCOPE .. 1 INTRODUCTION.. 1 Reference to planning .. 1 Classification of the road and street system.. 2 Measures of effectiveness (MOE) .. 3 Traffic calming .. 4 BASIC design PARAMETERS .. 4 The design vehicle.. 4 The design driver .. 5 The road surface .. 5 THE ELEMENTS OF design .. 6 design speed.. 6 Ceiling speed .. 6 design hour .. 6 SIGHT DISTANCE .. 8 Stopping sight distance (SSD) .. 8 Barrier sight distance (BSD) .. 8 Decision sight distance (DSD) .. 10 Passing sight distance (PSD) .. 10 Intersection sight distance (ISD) .. 10 HORIZONTAL ALIGNMENT .. 13 Tangents .. 14 Curvature and superelevation .. 14 Superelevation runoff.. 14 VERTICAL ALIGNMENT .. 15 Curvature .. 15 Gradients.. 17 Climbing lanes .. 18 CROSS-SECTION design .. 19iGUIDELINES FOR HUMAN SETTLEMENT planning AND DESIGNR oads: Geometric design and layout planningChapter 7iiGUIDELINES FOR HUMAN SETTLEMENT planning AND DESIGNC hapter 7 Roads: Geometric design and layout planningLanes.

The distinction drawn between geometric planning and geometric designis not always clear. In this document, geometric planning is described in Chapter 5: Planning Guidelines. A brief exposition of the difference between planning and design is offered below. Geometric planning Planning addresses the broad concepts in terms of

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