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1. INTRODUCTION
A major road widening project requires constructing nine link roads. The design traffic flows were obtained from revised forecast traffic produced by a traffic consultant. The forecast traffic flow was based on the Average Annual Daily Traffic in 2015 with percentage of Heavy Goods Vehicles (HGV). The geotechnical report confirmed that subgrade material is expected to be “chalk” and in situ CBR testing indicated that CBR, would be adequate for design. The design options are expected to reflect adequate consideration on sustainability to meet key policies on sustainable infrastructure development.
2. DESIGN TRAFFIC
The design traffic is the commercial vehicle loading over the design period expressed as the number of equivalent standard (80kN) axles.
Its calculated using the commercial vehicle flow F, traffic growth G and wear factors W, design period Y (generally adopted 40 years) and Percentage of vehicles in the heaviest loaded lane P.
To determine the design traffic, the AADF of commercial vehicles per day (cv/d) in one direction, at scheme opening (or for existing road schemes, the current flow) and the proportion in the OGV2 category shall be used.
With %HGV and AADT we estimate HGV, using figure 2.1 we estimate OGV2, the different beetwen HGV and OGV2 will be OGV1 + PSV.
According to clause 3.13 and 3.14 if a 40 year future design is chosen as it has been proven more economical for structural maitanance and therefore reducing total life cost
With the figure 2.3 and table 2.3 we obtain Growth Factor G and Wear Factor F for a new road.
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- References
- Design Manual for Roads and Bridges: Volume 7 Pavement Design and Maintenance.
- Volume 7 pavement design and maintenance section 2 pavement design and construction.
- Interim advice note 73/06 revision 1 (2009) design guidance for road pavement foundations (draft hd25).
- Volume 7 pavement design and maintenance section 2 pavement design and construction.
- Series 800 road pavements - (11/04) unbound, cement and other hydraulically bound mixtures.
- Series 900 road pavements- bituminous bound materials
- Series 1000
- Highway construction details b series.
