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AASHTO is a great association. I believe in the issues we stand for and I love working for the state DOTs. They are the ones that build, operate and maintain the facilities that are the backbone of our transportation system.Jim TymonAASHTO Executive Director
The AASHTO LRFD Bridge Design Specifications are intended for use in the design, evaluation, and rehabilitation of bridges. The specifications employ the Load and Resistance Factor Design (LRFD) methodology, using factors developed from current statistical knowledge of loads and structural performance. This 9th edition includes revisions to almost all sections of the specifications.
These guide specifications provide guidance for developing transportation contract specifications and are the national standard for best practices in highway and road construction. This consensus-based guide is used by states and local agencies as a standard requirement for roadway construction contracts and is a basis for those agencies to use in developing their own construction specifications. This edition focuses on electronic submittals, updated environmental requirements, and revised materials specifications. The guide is designed for use .....
This 2020 3rd edition includes the following revisions and updates from the previous 2015 2nd edition: new fracture mechanics-based model for reflective cracking in AC overlays over flexible, semi-rigid, and rigid pavements; new mechanistic-empirical model for short jointed plain concrete pavement (SJPCP) overlays of flexible pavements; new flexible and semi-rigid pavement global calibration coefficients; addition of non-structural preventative maintenance treatment consideration for flexible and rigid pavements; addition of five level 3 default distributions for normalized axle load spectra (.....
Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards, 40th Edition, 2020, Single-User PDF DownloadThe AASHTO Materials Standards contain specifications, test methods, and provisional standards commonly used in the construction of highway facilities. The Materials Standards are updated three times per year, in mid-April, mid-June, and at the end of July. The April Update revises the sections on Hydraulic Cement and Lime, Fresh Concrete, Hardened Concrete, Pavement Measurement, Bridge and Pavement Preservation, and Quality Assurance and Environmental. The June Update revises the sections on General Manufactured Materials, including Concrete .....
A Policy on Geometric Design of Highways and Streets, 7th Edition, 2018, commonly referred to as the “Green Book,” contains the current design research and practices for highway and street geometric design. This edition presents an updated framework for geometric design that is more flexible, multimodal, and performance-based than in the past. The document provides guidance to engineers and designers who strive to make unique design solutions that meet the needs of all highway and street .....
AASHTO – The American Association of State Highway and Transportation Officials – is a nonprofit, nonpartisan association representing highway and transportation departments in the 50 states, the District of Columbia, and Puerto Rico. It represents all transportation modes, including air, highways, public transportation, active transportation, rail, and water. Its primary goal is to foster the development, operation, and maintenance of an integrated national transportation system.
AASHTO works to educate the public and key decision-makers about the critical role that transportation plays in securing a good quality of life and sound economy for our nation. AASHTO serves as a liaison between state departments of transportation and the Federal government. AASHTO is an international leader in setting technical standards for all phases of highway system development. Standards are issued for design, construction of highways and bridges, materials, and many other technical areas.