Appendix C 5.2 Traffic Data
The road is a single-lane, one-way road, with a width of 4.0 m.
Traffic – 250 AADT, including 50% heavy vehicles consisting of:
- standard heavy vehicles = 35% (HV)
- large heavy vehicles = 15% (LHV).
Therefore, using Equation 2 (Section 5.2.5), EHV (%) can be calculated:
| EHV (%) | = | SHV(%) + (LHV(%) x 3) |
| = | (35) + (15 x 3) | |
| = | 80%. |
As the EHV(%) exceeds 65%, it is recommended to follow the procedure outlined in Section 5.2.7 to determine a nominal traffic volume for selection of an alternative basic voids factor, as follows:
| Nominal design traffic volume | = | (SHV + 3 × LHV) × 10 + number of light vehicles |
| = | (250 × 0.35 + 3 × 250 × 0.15) × 10 + 125 | |
| = | (88 + 113) × 10 + 125 | |
| = | 2135. |
The nominal design traffic volume of 2135 is used to determine the basic voids factor.