Highway Engineering

124 Highway Engineering

Example 5.3 Contd

Directional splits derived from local traffic data are applied to these design

flows in order to obtain the final directional flows, in this case, a 60:40 split

in favour of entry flows from the southern and western approaches, as shown

in Fig. 5.21.

1125 to 1500 vehicles/hr

450 to 600 vehicles/hr

750 to 1000 vehicles/hr

300 to 400 vehicles/hr

Figure 5.21Directional flows.

0.2

0.6

0.2

0.5

0.25 0.25

0.6

0.2

0.2

0.5

0.25 0.25

Figure 5.22

Directional splits.

Using information on local traffic flow patterns, turning proportions were

deduced as shown in Fig. 5.22.

Contd