I.4.1.7 Cross-section design 35

I.4.1.8 Intersections37

I.4.2.1 Street profiling 40

I.4.2.1.1 Arterial streets 43

I.4.2.1.2 Access streets 44

I.4.2.1.3 Basic access streets 44

I.4.2.1.4 Tertiary ways 45

I.4.2.2 Design strategy 43

I.4.2.2.1 Analysis and structural design periods 45

I.4.2.2.2 Pavement life cycle strategies 45

I.4.2.3 Design traffic estimates 48

I.4.2.3.1 Concepts for design traffic estimation 48

I.4.2.3.2 Traffic loading classes for structural pavement design 49

I.4.2.3.3 Traffic measurement and vehicle classification 50

I.4.2.3.4 Traffic investigation for pavement design 51

I.4.2.3.5 Calculation of design E80 51

I.4.2.3.6 Estimating the lane distribution of traffic 54

I.4.2.3.7 Design traffic on unpaved roads 55

I.4.2.4 Material and pavement selection55

I.4.2.4.1 Flexible pavements 56

I.4.2.4.2 Rigid pavements 59

I.4.2.4.3 Semi-rigid pavements 59

I.4.2.4.4 Pavement type selection per road category 60

I.4.2.5 Environmental considerations for pavement design 61

I.4.2.5.1 Material depth 61

I.4.2.5.2 Subgrade strength and delineation 62

I.4.2.6 Structural design 63

I.4.2.6.1 The design of flexible pavements 63

I.4.2.6.2 The design of rigid pavements 64

I.4.2.6.3 The design of semi-rigid pavements 65

I.4.2.6.4 The design of unpaved roads 65

I.4.2.7 Practical considerations 65

I.4.2.7.1 Drainage 65

I.4.2.7.2 Compaction of road layers 71

I.4.2.7.3 Pavement subgrade 71

I.4.2.7.4 Road/Street levels 72

I.4.2.7.5 Service trenches 72

I.4.2.7.6 Kerbs and channels 72

I.2

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0001

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The Neighbourhood Planning and Design Guide
Creating Sustainable Human Settlements

Developed by
Department of Human Settlements

Published by the South African Government
ISBN: 978-0-6399283-2-6
© 2019