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AASHTO Journal
FCC Opens 5.9 GHz Spectrum to Non-Transportation Use
Nov 20, 2020
The Federal Communications Commission adopted new rules for the 5.9 gigahertz (GHz) wireless communications spectrum on November 18, opening up ...
FHWA Issues ER Funds for Brent Spence Bridge Repairs
Nov 20, 2020
The Federal Highway Administration issued $12 million in “quick release” emergency relief on November 13 to help begin repairs on ...
Direct from the Source
Releases from AASHTO and State DOTs
Statement from AASHTO Executive Director Jim Tymon on FCC Action
Nov 18, 2020
WASHINGTON – The American Association of State Highway and Transportation Officials today reacted to the action by the Federal ...
New AASHTO President to Emphasize Workforce Development and Diversity
Nov 13, 2020
AASHTO Board Elects Second Woman President and First Ever Black Vice President WASHINGTON —The board of directors of ...
National Contest Selects USA’s Best and Most Popular Transportation Projects
Nov 9, 2020
Panel of Judges Award Grand Prize and Online Voters Decide the People’s Choice Award WASHINGTON – The Washington ...
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Featured Publication
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AASHTO LRFD Bridge Design Specifications, 9th Edition
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 new 9th edition includes revisions to almost all sections of the specifications. -
Guide Specifications for Highway Construction, 10th Edition
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 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 with the AASHTO .....
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Mechanistic-Empirical Pavement Design Guide: A Manual of Practice, 3rd Edition
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 (.....
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Standard Specifications for Transportation Materials and Methods of Sampling and Testing, and AASHTO Provisional Standards, 40th Edition, 2020, Single-User PDF Download
The 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 .....
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A Policy on Geometric Design of Highways and Streets, 7th Edition, Single User PDF Download
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 .....
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About AASHTO
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.