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AASHTO Roadside Design Guide PDF is developed and maintained by the AASHTO Subcommittee on Design, Technical Committee for Roadside Safety. The guide presents a synthesis of current information and operating practices related to roadside safety and is written in dual units—metric and U.S. Customary units.
The 2006 edition of the AASHTO Roadside Design Guide PDF supersedes the 1996 AASHTO publication of the same name and includes an update to Chapter 6, “Median Barriers,” which replaces Chapter 6 of the 2002 edition. In this guide, the roadside is defined as that area beyond the traveled way (driving lanes) and the shoulder (if any) of the roadway it self AASHTO Roadside Design Guide PDF
Consequently, roadside delineation, shoulder surface treatments, and similar on- roadway safety features are not extensively discussed. While it is a readily accepted fact that safety can best be served by keeping motorists on the road, the focus of the guide is on safety treatments that minimize the likelihood of serious injuries when a driver runs off the road. A second noteworthy point is that this document is a guide.
It is not a standard, nor is it a design policy AASHTO Roadside Design Guide PDF
It is intended for use as a resource document from which individual highway agencies can develop standards and policies. While much of the material in the guide can be considered universal in its application, there are several recommendations that are subjective in nature and may need modification to fit local conditions. However, it is important that significant deviations from the guide be based on operational experience and objective analysis.
To be consistent with AASHTO’s A Policy on Geometric Design of Highways and Streets, design speed is as the basic speed parameter to be used in this guide. However, since the design speed is often selected based on the most restrictive physical features found on a specific project, there may be a significant percent- age of a project length where that speed will be exceeded by a reasonable and prudent driver. Conversely, there will be other instances where roadway conditions will prevent most motorists from driving as fast as the design speed.
AASHTO Roadside Design Guide PDF, The metric values are those that would have been used had the guide been presented exclusively in metric units; the U.S. Customary values are those that would have been used if the guide had been presented exclusively in U.S. Customary units. Therefore, the user is advised to work entirely in one system and not to attempt to convert directly between the two. The reader is cautioned that roadside safety is a rapidly changing field of study, and changes in policy, criteria, and technology are certain to occur after this document is published.
ISBN Number : 1-56051-132-X Item Pages : 344 Pages Download : PDF File, AASHTO Roadside Design Guide PDF
File Type Download : PDF File AASHTO Roadside Design Guide PDF