Highway Design Manual

The primary function of the New Hampshire Department of Transportation (NHDOT) Highway Design Manual (HDM) is to provide requirements and guidance on current highway design methods and policies, and to ensure uniformity of design practice throughout the NHDOT. This Manual is intended to be used in conjunction with the guidance of the American Association of State Highway and Transportation Officials (AASHTO) and the Federal Highway Administration (FHWA). This manual should not supersede the application of sound engineering principles by experienced design professionals.

The HDM does not eliminate the need for other references. Directives from the NHDOT office and FHWA, books, publications, and other related material may need to be referred to for further details, clarification, or interpretations. Subsequent Official Issuances by the NHDOT may supersede portions of the material in the HDM.

Variations from this manual will be necessary for special or unusual conditions, or between the issuances of new or revised source documents and any corresponding updates of the HDM. Consequently, instructions in this document are not intended to preclude the exercise of individual initiative and engineering judgment in reaction to site-specific conditions. Justifications for variations from this manual are to be appropriately documented.

Website information is subject to periodic change and/or updating without notice. Anyone relying on such information must bear the risk that the information downloaded previously may not be the most current version available. It is the user's responsibility to check often for updates.

Please e-mail any suggestions, additions, revisions, etc. to: Bureau34@dot.nh.gov with "Highway Design Manual" as the subject line.

Highway Design Manual Vol. 1

Contents

Reference

Highway Design Manual Vol. 2

Contents