GovernmentofthePeople’sRepublicofBangladesh
MinistryofCommunications
RoadsandRailwaysDivision
GeometricDesignStandards
for
RoadsHighwaysDepartment
DraftVersion4
October2000
GeometricDesignofRHDRoadsVers.4i
Contents
Glossaryiii
1.Introduction1
1.1PurposeofthisManual1
1.2RoadMaterialsandStandardsStudy1
1.3DesignApproach1
1.4Acknowledgements1
2.DesignStandards2
2.1DesignTypesandStandards2
2.2RoadClassification2
2.3TrafficVolumeandComposition2
2.4TrafficCapacity4
2.5DesignSpeed4
2.6SightDistance5
3.TheDesignProcess6
3.1General6
3.2BasicParameters6
3.3SelectDesignTypeandDesignSpeed6
3.4DetermineTrialAlignment6
3.5ChecktheTrialAlignmentAgainstDesignSpeedStandards8
3.6DoaDetailedConsistencyCheck8
3.7AmendtheAlignment8
3.8Safety,Environment,LandandResettlement8
3.9ChecktheEconomicAssessment9
4.Cross-Sections10
4.1CarriagewaysandShoulders10
4.2DesignTypeCross-Sections11
4.3ProvisionforNMVsandPedestrians11
4.4BusBaysandStoppingPlaces12
4.5TrafficCalmingThroughTownsandVillages12
4.6LateralandVerticalClearances13
4.7Crossfall13
4.8Drains14
4.9Embankments14
4.10DesignLevels14
4.11Cross-SectionsatBridgesandCulverts15
5.HorizontalAlignmen