Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO GDHS 3:1994
• Năm ban hành / Publication date: 1994
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Policy on Geometric Design of Highways and Streets

Thay thế bằng / Replaced by

AASHTO GDHS:2011

• Số trang / Page: 1

Phạm vi áp dụng / Scope of standard

PREFACE

This Policy was developed as part of the continuing work of the
Standing Committee on Highways. The Committee, then titled the
Committee on Planning and Design Policies, was established in 1937
to formulate and recommend highway engineering policies. It has
developed A Policy on Geometric Design of Rural Highways, 1954 and
1965 editions, A Policy on Arterial Highways in Urban Areas,
1957, A Policy on Design of Urban Highways and Arterial Streets,
1973, Geometric Design Standards for the National System of
Interstate and Defense Highways, 1956 and 1967, Geometric Design
Standards for Highways Other Than Freeways, 1969, A Policy on
Geometric Design of Highways and Streets, 1984 and 1990, A Policy
on Design Standards- Interstate System, 1991, and a number of
other AASHO and AASHTO policy and "guide" publications.

An AASHTO publication is typically developed through the
following steps: (1) The Committee selects subjects and broad
outlines of material to be covered. (2) The appropriate
subcommittee and its task forces, in this case the Subcommittee on
Design and its Task Force on Geometric Design, assemble and analyze
relevant data and prepare a tentative draft. Working meetings are
held and revised drafts are prepared, as necessary, and reviewed by
the Subcommittee, until agreement is reached. (3) The manuscript is
then submitted for Standing Committee on Highways approval, and
then Executive Committee approval. Standards and policies must be
adopted by a two-thirds vote by the Member Departments before
publication. During the developmental process, comments were sought
and considered from all the States, the Federal Highway
Administration, and representatives of the American Public Works
Association, the National Association of County Engineers, the
National League of Cities, and other interested parties.

The Omnibus Trade and Competitiveness Act of 1988 amended by the
Metric Conversion Act of 1975 required each federal agency to
convert to the metric system. In response the U. S. Department of
Transportation, Federal Highway Administration, established
September 30, 1996 as the date for metrication of plans,
specifications, and estimates for projects constructed with federal
aid. This action required AASHTO to metricate this policy. ASTM
E380 Standard Practice for Use of the Intei-national System of
Units (SI) was adopted by FHWA as the standard to guide metric
conversion. Following the procedures outlined above, the Task Force
on Geometric Design met in 1992 to begin work which resulted in the
publication in 1993 of the Interim Selected Metric Values for
Geometric Design as an addendum to the 1990 Policy and subsequently
this current edition. This new Policy supersedes the Interim Guide.
A continuing effort will be maintained by the Subcommittee on
Design to keep the Policy up to date with future developments in
geometric design.