Attachment 2 - Traffic Report · MCU13/0251

Capacity analysis of the upgraded intersection with a 2-stage right turn, for 2020 PM with the proposed
development fully operational (including all of the currently approved accommodation units) has been
undertaken using the Sidra package.

The first stage of the analysis (for all movements, except the second stage of the right turn exit that
involves entering the southbound traffic stream) uses the same intersection layout as for the standard
analysis, with default Sidra parameters, but without a southbound traffic volume.

The second stage of the analysis uses a critical gap for the second stage of the right turn of 5s (which is
Sidra default for a left turns movement from a minor road – which is essentially the same conditions as
for the second stage of the right turn), and a follow-up headway also of 5s. Normally the follow-up
headway would be shorter than the critical gap, but because there will not be more than one vehicle
stored in the median waiting to undertake the second stage of the right turn, the follow-up headway is
input as being the same as the critical gap.

The analysis indicates satisfactory operating conditions with summary output as follows (movement
summary output from the analysis is attached at Appendices E and F). This represents significantly
improved conditions compared with the existing intersection configuration with the current approval, thus
indicating that the upgrading works would more than ameliorate additional development impacts at the
intersection:

                                      Degree of Saturation          95th percentile queue on minor leg
2020 PM peak with development
1st stage right turn                     0.65                       3.1 vehicles
2nd stage right turn                     0.42                       0.6 vehicles


6.0 Parking provisions

The proposed retail component of the development comprises 1626 sq m GFA (excluding the 94 sq m
outdoor area) and has a use area according to Council’s definition of 1690 sq m (including the outdoor
area).

The development proposes 85 on-site parking spaces including 13 staff spaces, 2 motorcycle spaces,
and 2 disabled spaces.

Motorcycles comprise roughly 2% of the vehicle fleet so it is reasonable to include the 2 proposed
motorcycle spaces in the overall parking provision.

Also, staff parking at shopping centres typically comprises roughly 15% of the overall parking demand,
so the proposed 13 staff parking spaces is a reasonable number.

Council’s standard parking requirement at shopping centres is 1 space per 20 sq m for the first 100 sq m
of use area, plus 1 space per 15 sq m for the balance of the use area. This would generate a parking
requirement of 111 spaces. However, the provision of 85 parking spaces as proposed would be
satisfactory, and a relaxation of Council’s standard requirements is appropriate on the following basis:

(i)         The proposal is essentially a shopping centre, which could all be utilised for shops, or there
            could be some restaurant or office uses within the specialty tenancies.

(ii)        The normal parking requirement at shopping centres based on parking demand surveys
            throughout south east Queensland is 5.25 spaces per 100 sq m GFA. At that rate the
            proposed 1626 sq m GFA would require 85 parking spaces.

(iii)       It is then a question of whether or not to include the 94 sq m outdoor eating area in the GFA
            calculation for carparking. For a stand-alone restaurant, or for a small development that
            comprises predominantly restaurants, then the outdoor area would most definitely need to be


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