Attachment 9 - Traffic Engineering Report

accounted for in the above survey. Following the relocation of the clubhouse, these vehicles will be diverted
into the subject site; as opposed to being ‘New Trips’.

6.3 Future Base Traffic Volumes
To estimate future traffic demands in the absence of the proposed development, a conservative annual
average compound traffic growth rate of 2.0% has been applied to the 2019 surveyed traffic volumes to
obtain both opening year (2024) and 10-year design horizon (2034) demands.

This growth rate is based on Council’s current population estimates of the expected growth within the
Cooroy catchment, as well as historical traffic growth on Myall Street over the last 10-years (as indicated
from DTMR’s AADT data for traffic count site 20049).

TTM has identified three assessment periods for the road network as follows:

Current Traffic Scenario

This scenario includes the 2019 traffic volumes modelled over the existing road network. This analysis has
been performed for both the AM and PM peaks.

Opening Year (2024) Traffic Scenario

This analysis incorporates a 2.0% per annum increase in the background traffic volume for a period of 5 years
from the most recent survey. This analysis has been performed for both the AM and PM peaks at the Myall
Street/ Site Access intersection and the Myall Street/State Route 6/Nandroya Road Roundabout Intersection.

2034 Traffic Scenario

This analysis incorporates a 2.0% per annum increase in the background traffic volume for a period of (10
years past opening year). This analysis has been performed for both the AM and PM peaks at the Myall
Street/ Site Access intersection.

6.4 Development Traffic
6.4.1        Estimated Development Traffic Generation
6.4.1.1 Relocatable Dwellings – New Trips
In order to more accurately predict the levels of traffic generation associated with the relocatable dwelling
aspects of the proposed development, TTM have integrated the results of previously undertaken traffic
surveys at the access/egress points of an existing relocatable dwelling development. The existing
development was of comparable scale and similarly situated in proximity to the nearby township. The
surveys were undertaken on the 18th July 2019 and reflected an AM peak hour generation rate of
0.189vph/dwelling and PM peak hour generation rate of 0.124vph/dwelling.

The surveys indicated that 50% of vehicles were inbound in the AM peak hour period, with the remaining
50% outbound. 60% of vehicles were surveyed to be travelling inbound in the PM peak hour period with the
remaining 40% travelling outbound.


Site: Lot 2 & 3 Myall Street, Cooroy                                                                     18
Reference: 19BRT0357