Attachment 6 - Traffic Impact Assessment

We also have traffic count information over a weekly period in late January 2009 on the northern David
Low Way leg of the Heron Street roundabout. That traffic count information is attached at Appendix A.
That traffic count was at a location in David Low Way just north of the Heron Street roundabout, and thus
is on the same section of David Low Way as the southern leg of the Woodland Drive intersection. The
critical information from that week long survey is:

(i)         Thursday was the busiest day of the week, and the peak hours were in the 8-9am and 3-4pm
            period on each weekday.

(ii)        Saturday was less busy than the weekdays, and Sunday was less busy than Saturday.

(iii)       Peak hour traffic on weekdays were up to about 1200 vehicles per hour in the am and pm
            peaks (this compares with 1018 vph in the am peak and 1032 vph in the pm peak on the
            comparable road segment from the recent survey).

In addition, we also have results of peak hour traffic counts at the David Low Way / Heron Street
intersection from early May 2015, as well as a tube count in David Low Way near Woodland Drive from
March 2015. A comparison of corresponding peak hour traffic flows on David Low Way from three recent
sets of traffic count information follows:

                                                    David Low Way peak hour traffic flows
                                                    Northbound                     Southbound
                                                    AM         PM                  AM         PM

September 2015
(Southern leg of Woodland Dr intersection)          453 vph      456 vph            565 vph      535 vph

May 2015
(Northern leg of Heron St intersection)             944 vph      785 vph            754 vph      766 vph

March 2015                                          797 vph      667 vph            675 vph      657 vph

The traffic count information discussed above suggests that through traffic flows on David Low Way from
the September 2015 traffic count at the Woodland Drive intersection were unusually low for some
reason. Thus, for the purposes of this assessment of impacts at the David Low Way / Woodland Drive
intersection, we have used the higher May 2015 peak hour through traffic flows along David Low Way.


3.2 Estimation of traffic generated by potential redevelopment

The standard peak hour traffic generation rate for office developments is 3 vph per 100 sq m GFA with
an 80/20 directional split. At that rate the proposed 884 sq m office building would generate peak hour
traffic flows of 27 vehicles per hour. For the purposes of this assessment we have assumed it would
generate peak hour traffic flows of 30 vehicles per hour, with 24 arriving and 6 departing in the AM peak,
and vice versa in the PM peak.

We have assumed that the community house building would generate peak hour traffic flows at a similar
rate to an office development. Thus, we have assumed that the 335 sq m community house building
would generate peak hour traffic flows of 10 vehicles per hour, with 8 arriving and 2 departing in the AM
peak, and vice versa in the PM peak.

For completeness, we have also included allowance for traffic generated by potential future parking in
Rufous Street for an estimated 75 longer term staff parking spaces to accommodate employees of the
Peregian commercial area. For the 75 longer term staff parking spaces we have assumed they would
generate peak hour traffic flows of 40 vph, with all arriving in the AM and all departing in the PM.

Based on the weekday peak hour distribution of Heron Street traffic north and south along David Low


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