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# Appendix-H - Geometric Design Manual-2002 Appendix H...

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Appendix H Terms/Definitions Geometric Design Manual-2002 Page H-2 Ethiopian Roads Authority B Back Slope Area proceeding from ditch bottom to the limit of the earthworks. Borrow Material not obtained from roadway excavation but secured by widening cuts, flattening cut back slopes, excavating from sources adjacent to the road within the right-of-way, or from selected borrow pits as may be noted on the plans. Bus Lay-Byes Lay-by reserved for public service vehicles. C Camber Convexity given to the curved cross-section of a roadway or footpath. Capacity Maximum practicable traffic flow in given circumstances. Capping Layer A layer of selected fill material placed on the topmost embankment layer or the bottom of excavation. Carriageway Part of the roadway including the various traffic lanes and auxiliary lanes but excluding shoulders. Centerline Axis along the middle of the road. Circular Curve Usual curve configuration used for horizontal curves. Clear Zone Unencumbered roadside recovery area. Climbing Lane An auxiliary lane in the upgrade direction for use by slow moving vehicles and to facilitate overtaking, thereby maintaining capacity and freedom of operation on the carriageway. Coefficient of Friction Ratio of the frictional force on the vehicle and the component of the weight of the vehicle perpendicular to the frictional force.
Appendix H Geometric Design Manual-2002 Terms/Definitions Ehiopian Roads Authority Page H-3 Collector Roads Secondary Roads linking locally important centers to each other, to more important centers or to higher class roads. Compound Curve Curve consisting of two or more arcs of different radii curving in the same direction and having a common tangent or transition curve where they meet. Control of Access Conditions where the right of owners or occupants of adjoining land or other persons to access, light, air or view in connection with a road is fully or partially controlled by public authority.

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