Standards News

American Association of State and Highway Transportation Officials / 2012 /

The provisions of these Specifications are intended for the design, evaluation, and rehabilitation bridges and is mandated by FHWA for use on all bridges using federal funding. These Specifications employ the Load and Resistance Factor Design (LRFD) methodology using factors developing from current statistical knowledge of loads and structural performance. Seismic design shall be in accordance with either the provisions in these Specifications or those given in the AASHTO Guide Specifications for LRFD Seismic Bridge Design. Construction specifications consistent with these design specifications are the AASHTO LRFD Bridge Construction Specifications. Unless otherwise specified, the Materials Specifications referenced herein are the AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing. A new chapter on sound barriers includes the material formerly contained in the AASHTO Guide Specifications for Structural Design of Sound Barriers. Mechanical, electrical, and special vehicular and pedestrian safety aspects of movable bridges are not included in this specification.

Keywords:
LRFD

This publication is available only in PDF edition.

American Association of State and Highway Transportation Officials / 2011 / 906 pages

A Policy on Geometric Design of Highways and Streets, 6th Edition, 2011, commonly referred to as "the Green Book," contains the current design research and practices for highway and street geometric design. Developed by the Technical Committee on Geometric Design, a technical committee of the Subcommittee on Design, the document provides guidance to highway engineers and designers who strive to make unique design solutions that meet the needs of highway users while maintaining the integrity of the environment. It is also intended as a comprehensive reference manual to assist in administrative, planning, and educational efforts pertaining to design formulation.

Deisgn guidelines are included for freeways, arterials, collectors, and local roads, in both urban and rural locations, paralleling the functional classification used in highway planning. The book, similarly, is organized into the same functional categories to reflect the relationship between highway design and function.

This publication is available both in printed and PDF edition.

American Association of State and Highway Transportation Officials / 2011 / 345 pages

The Roadside Design 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.

The guide is intended to be used as a resource document from which individual highway agencies can develop standards and policies. It includes a synthesis of current information and operating practices related to roadside safety. It focuses on safety treatments that can minimize the likelihood of serious injuries when a motorist leaves the roadway. This guide was written for use by design engineers and professionals involved in roadside safety and is considered a significant toll that combines current research with practical experience.

The 2011 edition of the AASHTO Roadside Design Guide has been updated to include hardware that has met the evaluation criteria contained in the National Cooperative Highway Research Program (NCHRP) Report 350: Recommended Procedures for the Safety Performance Evaluation of Highway Features and begins to detail the most current evaluation criteria contained under the Manual for Assessing Safety Hardware, 2009 (MASH). For the most part, roadside hardware tested and accepted under older guidelines that are no longer applicable has not been excluded in this edition.

This publication is available only in printed edition.

American Association of State and Highway Transportation Officials / 2011 /

The 31st Edition of the Standard Specifications for Transportation Materials and Methods of Sampling and Testing (Materials Book), with 75 revised and 3 new specs and test methods. The 31st Edition of the Materials Book contains 363 materials specifications and test methods commonly used in the construction of highway facilities. The specifications have been developed and maintained by transportation departments through participation in AASHTO?s Subcommittee on Materials. The book edition is organized in two volumes, Materials and Testing, and each volume has been separated into two books.

This publication is available only in printed edition.