Table of Contents

Appendix E 1.7 Study Network Definition

  • All haul routes associated with the development will need to be assessed in accordance with Criterion 4 (in Chapter 3.2 of source document).
  • To identify the spatial extent of investigation, information on existing traffic volumes and ESAs was obtained. In most cases, AADT and the percentage of commercial traffic will be available from the MR district office. Supplementary traffic counts may be required.

Traffic operation

  • For traffic operation, assessment is required where the development traffic exceeds the thresholds set by Criteria 3 and 4.
  • This is the case for road section A (Criterion 4), road section B (Criterion 3), road section C (Criterion 4) and road section D (Criterion 4).
  • Intersection X also requires assessment (Criteria 3 and 4).

Pavement impacts

  • Assessment of pavement impacts is required where development traffic generates an increase in ESAs equal to or greater than 5% (Criterion 2).
  • As shown in Figure E 2, the development will generate an increase in ESAs equal to or greater than 5% on road sections A, B and C. Road section A extends for the full distance of the haul route to the west.

Traffic generation – heavy commercial vehicles

Average demand 200 000 t/year (26.5 t/truck x 312 days/year)

 

24 loaded truck trips/day

(24 unloaded trips/day to the site/24 loaded trips/day from the site)

=48 heavy commercial vehicle trips/day

Peak demand (twice the average extraction)

 

48 loaded truck trips/day

(48 unloaded trips/day to the site/48 loaded trips/day from the site)

=96 heavy commercial vehicle trips/day

Traffic generation – all vehicles

 

80 light vehicle trips/day + 96 heavy commercial vehicle trips/day

(Total trips on segments A, B & C)

=176 total vehicle trips/day.

Existing ESAs for each road section should be calculated, as shown below, by weighting the AADT in accordance with the proportion of existing commercial traffic.

ESA calculation (road section B)

AADT=400 vpd eastbound
Commercial vehicle (CV) %=10%
ESA:CV ratio=1.3 (derived from MR Pavement Design Manual)
Existing ESA (Section B)=400 vpd x 10% CV x 365 days/year x 1.3 ESA/CV
 =18 980 ESA/year