Highway Engineering

204 Highway Engineering

Buses and coaches

2-axle rigid

3-axle rigid

3-axle articulated

4-axle rigid

4-axle articulated

5-axles or more

PSV

OGV1

OGV2

Figure 7.6Vehicle classifications.

Traffic flow at opening (cv/d) – 1 direction

100 1000 10000 30000

1

10

100

1000

Design traffic (msa)

75%

50%

25%

100%

OGV2

Figure 7.7Design traffic for flexible and flexible composite pavements (20-year design

life) – single carriageway (HD 24/96) (DoT, 1996).