坦桑尼亚道路几何设计手册 Tanzania Road Geometric Design Manual 2012

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THE UNITED REPUBLIC OF TANZANIA

MINISTRY OF WORKS

2011 Edition

ROAD GEOMETRIC DESIGN MANUAL

ROAD GEOMETRIC DESIGN MANUAL MINISTRY OF WORKS, TANzANIA 2011 EDITION

Ministry of Works

Road Geometric Design Manual Preface

The Ministry of Works has prepared this Road Geometric Design Manual - 2011 Edition for design of

roads in order to promote uniformity in design procedures in the country.

The major benets to be gained in applying this manual are the harmonization of professional practice

and the assurance of satisfactory levels of safety, health and economy with due consideration of the

objective conditions and need of the country. The Road Geometric Design Manual will be useful to

designers, researchers, academia and professionals interested in geometrics of roads. The 2011 Edi-

tion Road Geometric Design Manual supersedes the Ministry of Communications and Works Draft

Road Manual - 1989 Edition.

Standards in this manual are general since they cannot cover all site specic conditions. The stand-

ards are based on prevailing and anticipated future conditions of vehicle dimensions and performance

characteristics and transportation demands. Since there is no absolute optimum design the principles

and techniques in this manual must be adhered to. Unless otherwise it is envisaged that a combina-

tion of good practices with the judgment and expertise of the engineering profession will be applied to

produce innovative and favourable outcomes that benet the travelling public and our communities.

It is our hope that the manual continues to be comprehensive in recognition of the diverse needs

of transportation professionals for effective planning, design guidance, construction, maintenance,

operational and safety performance of new facilities as well as major reconstruction of road projects

in the country.

Also, the manual provides a wide range of potential applications of road design as well as explaining

to the public the trade-offs associated with the geometrics of roads in our country.

In addition, the manual is a technical working document that might evolve from time to time due to

dynamic nature of the transportation industry as well as socio and technological development, it is

imperative to be updated periodically. Therefore, the Ministry wishes to welcome comments that

might arise in the application of this manual so as to come up with the future revisions of the manual

that addresses effective design.

Dar-es-Salaam Ambassador Herbert E. Mrango

May 2012 Permanent Secretary

Ministry of Works

Preface

Ministry of Works

Road Geometric Design Manual

Acknowledgements

The preparation of this Road Geometric Design Manual - 2011 has been financed by the Government

of the United Republic of Tanzania as part of the programme to enhance technical standards, specifi-

cations and offer technical guidance in the road sub sector. The manual has been prepared through the

technical co-operation between the Ministry of Works (MOW), the Tanzania National Roads Agency

(TANROADS) and the Norwegian Public Roads Administration (NPRA).

The Ministry gratefully acknowledges the valuable contributions made by Eng. Mussa I. Iyombe

(Director of Transport Infrastructure in the Ministry of Works), Eng. Alois Matei and Eng. Fintan

Kilowoko (Assistant Directors in the Ministry of Works) and Eng. Patrick A. L. Mfugale (Chief Ex-

ecutive of TANROADS) for their continued guidance during preparation of the manual. The Ministry

also extends its grateful acknowledgement to the Manual Working Group comprising the Reference

Group and the Manual Development Team, including the Stakeholders; for the preparation, review

and production of the manual.

TANROADS HQ:

Eng. Jason Rwiza

Eng. Chrispianus Ako

Eng. Poliect Chuwa

Eng. Victor Seff

Eng. William Shila

TANROADS Regional Offices:

Eng. Damian Ndabalinze

Eng. Deusdedit Kakoko

Eng. Joseph Nyamhanga

Eng. Boniface Kulaya

Reference Group

Acknowledgements

Manual Development Team

The Working Group wishes to acknowledge the significant contribution from all people who gave

critical comments and advice during the preparation of this Manual. In particular, the comprehensive

input from contributors within the Ministry of Works, professional bodies, the private sector, educa-

tional institutions and other stakeholders who commented on the draft, is gratefully acknowledged.

Also, the Working Group acknowledges use of valuable information from corresponding manuals in

the neighbouring countries. Particularly the Geometric Design Manual of Uganda was of great value

in developing this Manual.

Ministry of Works:

Eng. Isaac Mwanawima

Eng. Laurent Kyombo

Eng. Rubirya Marwa

Eng. Ms Light Chobya

Eng. Peter Sikalumba

Eng. Fabian Masembo.

TANROADS:

Eng. Ebenezer R. Mollel

Eng. Emmanuel M. N. Msumba

Eng. Noel K. Ngowi

NPRA:

Eng. Otto Kleppe

Eng. Kjell Solberg

Eng. Ms Sigrun Sorensen

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