In response to findings in the independent traffic impact assessment reports Boral will undertake the following site access and local road upgrades to support the two projects: 

1. Upgrade the Old Coach Road access to the Reedy Creek KRA Project site to a roundabout suitable for relevant design vehicles. All heavy vehicles / trucks associated with quarry operations will be limited to travelling to / from the site via the north. 

2. Widening of Old Coach Road to a two-lane, undivided, sub-arterial standard to match the upgraded form north-west of the site.  This results in approximately 250m of road widening to an 11.0m formation. 

3. Provision of an auxiliary through lane at the Old Coach Road / Pacific Motorway northbound off-ramp traffic signals to reduce queueing and delays for northbound traffic and Pacific Motorway northbound off-ramp traffic. 

4. Provision of an auxiliary left-turn lane at the Scottsdale Drive / Stapley Drive / Bayswater Avenue traffic signals to provide additional queue storage and capacity for a heavy, constrained movement.  

Project scope 

• Old Coach Road curves quite sharply in proximity to the proposed roundabout.  A roundabout at this location will assist in slowing traffic through these curves. 

• When approaching from the north-west Old Coach Road rises towards the proposed roundabout location at a grade of approximately 15%. 

• In the direct vicinity of the proposed roundabout Old Coach Road flattens out and has a gentler grade of approximately 5%.  

• The south-east approach has a downgrade of approximately 3% and features back-to-back curves.  Again, the proposed roundabout is expected to contribute to a lower speed environment on this section of Old Coach Road.  

Project scope 

• It is proposed that Boral will provide a second northbound through lane for approximately 250m through the ramp signals to improve saturation, reduce delay and reduce queuing.  

• The improvements to this intersection affect not only northbound traffic on Old Coach Road, but also reduce queueing, delay and saturation for traffic on the motorway off-ramp, particularly in the AM peak hour.  

Project scope 

It is proposed to extend the left turn slip lane from Stapley Drive to Scottsdale Drive to include a true auxiliary lane with a length of approximately 70.0m.  This provides additional storage for the heaviest movement in both the AM and PM peak hours and reduces blockages of the other lanes on Stapley Drive.  This movement is also noted as being used by three Translink bus routes (Routes 757, 759 & 760). 

The assessment shows that the proposed upgrade significantly improves several key traffic criteria far beyond the development impact, including:  

• DOS typically reduced by >0.3  

• Average Delay typically reduced by approximately 40-50%  

• 95th percentile queues reduced by a minimum of 100m.