15 - Chapter-15 - Geometric Design Manual-2002 Chapter 15...

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Chapter 15 Geometric Design Manual-2002 Ethiopian Roads Authority Page 15-1 15 R OAD F URNITURE AND M ARKINGS 15.1 Introduction This chapter deals with road furniture and markings. These features include the elements intended to improve the driver's perception and comprehension of the continually changing appearance of the road. Elements addressed herein include traffic signs, road markings, marker posts, traffic signals, and lighting. Traffic signs provide essential information to drivers for their safe and efficient maneuvering on the road. Road markings delineate the pavement edges and thereby clarify the paths that vehicles are to follow. Marker posts assist in a timely perception of the alignment ahead and, when equipped with reflectors, provide good optical guidance at night. Traffic signals are key elements for the efficient functioning of many urban roads and for some rural junctions. Finally, lighting is provided to improve the nighttime safety of a road. Traffic signs, road markings, and marker posts shall conform to ERA/RTA standards. Standards for traffic signs and road markings and their placement are provided in the ERA Standard Detail Drawings-2002. 15.2 Traffic Signs The extent to which signs and markings are required depends on the traffic volume, the type of road, and the degree of traffic control required for safe and efficient operation. The safety and efficiency of a road depends to a considerable degree on its geometric design. However, physical layout must also be supplemented by effective traffic signing as a means of informing and warning drivers, and controlling drivers. Design of traffic signs and road markings is an intricate part of the design process. Traffic signs are of three general types: ¾ Regulatory Signs: indicate legal requirements of traffic movement ¾ Warning Signs: indicate conditions that may be hazardous to highway users ¾ Informatory Signs: convey information of use to the driver 15.3 Road Markings The function of road markings is to encourage safe and expeditious operation. Road markings either supplement traffic signs and marker posts or serve independently to indicate certain regulations or hazardous conditions. There are three general types of road markings in use- pavement markings, object markings and road studs.
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15 - Chapter-15 - Geometric Design Manual-2002 Chapter 15...

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