Traffic Response

The proposed access driveway is to be a 9.0m wide Type B2 driveway and access from the existing internal
road. The proposed driveway would allow for two-way vehicle movements. This provision is in accordance
with the requirements outlined in AS2890.1. Therefore, TTM consider the proposed access driveway to be
suitable to cater for the needs of the development.

Sight Distance

TTM has undertaken a sight distance assessment of the proposed access driveway.

TTM expects that the vehicle speeds approaching the site access would be very low, in the order of
approximately 20kph. This is due to the following:

•   The proposed access is to be located from the school’s access road, where vehicles are required to
    perform a turn manoeuvre from Walter Hay Drive to access the car park
•   Vehicles typically slow down when accessing the school road networks, as there are a larger number of
    unpredictable pedestrian movements

AS2890.1 outlines sight distance requirements for roads with 40kph design speeds and above. Therefore, to
assess the sight distance of the proposed access driveway, TTM has derived the Stopping Sight Distance
(SDD) from the equation outlined in Austroads Guide to Road Design Part 3: Geometric Design, as shown in
Figure 2.

TTM has estimated the Minimum SSD required and has assumed the following parameters:

     •    RT       -         2s reaction time, as per AS2890.1
     •    V        -         20kph, design speed for the car park
     •    d        -         0.46, as per Austroads, suitable for lower speed urban roads
     •    a        -         0%




Figure 2: Stopping Sight Distance Equation

TTM has estimated the minimum SDD for a road with a design speed of 20kph to be 28m. TTM has
estimated the sight distance provided from the proposed access driveway is approximately 28m. Therefore,
TTM consider that the proposed access arrangement would be provided with suitable sight distance.


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