PAD - LGED

Annex 9: Design Summary of the Project Components
Bangladesh: Second Rural Transport Improvement Project (P123828)
ROAD DESIGN
1. Information included in this Annex is based on LGED’s Consolidated Appraisal Report
Document (February/ March 2012), particularly Chapter IV- Technical Aspects, Project Scope
and Cost Analysis Document – which was prepared by LGED’s Project Preparation Consultants
(PPC). This chapter includes information on design details and typical cross sections. The
Report should be referred to for details and the information included in this Annex is for
summary purposes only.
Upazila Road (UZR) - Improvement
2. Raising and Widening of Upazila Road Embankment. In general, horizontal alignment
will be followed for the existing road to avoid existing structures and to save costs. However,
some realignment may require elimination of sharp bends and/or bridge approaches. Vertical
alignments will follow an embankment height of about 0.6m above ten-year flood level. The
embankment side slopes will be one (vertical) to 1.5 (horizontal), or one (vertical) to two
(horizontal). The following table shows the geometric dimensions of typical Upazila Roads:
Table 9.1: Geometric Dimension of UZR
Carriageway width
3.7 m
Total shoulder width (each side) 1.8 m
Hard shoulder width (each side) 0.9 m
Carriageway camber 3%
Shoulder camber 5%
Maximum gradient 3%
Road crest width
7.3 m
3. A typical road cross section is shown in Chapter IV of LGED’s Consolidated Appraisal
Report Document. It may often be necessary to modify the above standards to suit local
conditions and to reduce costs. For example, in some villages the road shoulder width could be
reduced due to the presence of buildings close to the road. In vertical alignment, in some cases,
embankment height will be reduced from 0.6m above ten-year flood level to save buildings or to
cut costs in consultation with LGED.
Union Road (UR)
4. Raising and Widening of Union Road Embankment. The same specifications and
approaches used for raising and widening Upazila roads will be applied to Union roads. The
following table shows the geometric dimensions of Upazila Roads:
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