RFI engineering - 20230504 RFI response

            a. demonstrate compliance with Section 3.2.2 of Austroads’ Guide to Road Design Part 4A
            by calculating the minimum Safe Intersection Sight Distance and demonstrating an
            unbroken line-of-sight can be achieved, both longitudinally and from a ‘layout’ perspective;
            b. demonstrate compliance with Section 3.2.3 of Austroads’ Guide to Road Design Part 4A
            by demonstrating an unbroken line-of-sight can be achieved, both longitudinally and from
            a ‘layout’ perspective, for the Minimum Gap Sight Distance between both conflict points
            and vehicles travelling along Maple Street; and
            c. assume all parking (cars and buses) are occupied when demonstrating an unbroken line-
            of-sight.

            A traffic assessment has been prepared to validate the adequacy of the sight distances from
            the proposed access with respect to the above points.

            It found that with the removal of the two on-street spaces immediately north of the
            proposed driveway access, the development would be able to achieve the required lines
            of sight to the north. Although a bus in the bus bay would obstruct the sight lines, it is
            considered that the transitory nature of the bus passenger pickup and drop off the bus does
            not represent a permanent obstruction. As drivers will typically have heightened alertness
            due to the requirement to give way to buses, they are more likely to be cautious in passing
            which will ensure safety of the access.

            Assessment of the line of sight to the south found that due to the topography and presence
            of on-street parking, the required lines of sight weren’t able to be achieved without further
            loss of on-street parking. The development therefore proposes a left out only exit which will
            be signed to ensure compliance.

            Issue: Earth Bank Discharge
            3. Provide additional detail demonstrating where and how the runoff from the proposed
            Earth Bank will discharge. The additional detail must be prepared by a suitably qualified
            person (RPEQ – Registered Professional Engineer of Queensland).

            The earth bank proposed for the erosion and sediment controls is a diversion berm which
            will intercept clean run-off from the upstream catchments (the existing dwelling to be
            retained) and divert it around the site works separating the non-polluted water from the
            sediment laden run-off from within the works area. The outlet will discharge at the level of
            the exterior surface through a rock energy dissipating outlet to prevent scour of the verge
            and minimise impacts to pedestrians.

            Issue: Passing Opportunity & Vehicle Manoeuvrability
            4. Provide additional detail demonstrating how the internal driveway between Chainages
            40 and 80 will function to avoid vehicle accidents. The additional detail must be prepared
            by a suitably qualified person (RPEQ – Registered Professional Engineer of Queensland) and
            include, but not be limited to:




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