Appendix D - Sight Distance Assessment

Technical Note
Address:          216 Black Mountain Road

Applicant:        Murray Richardson



1.       Background

Tod Consulting were requested to undertake an engineering review of the driveway location(s) for a
proposed 2 lot subdivision at 216 Black Mountain Road (lot 9 on RP131369), in support of a Lot
Reconfiguration development application to Noosa Shire Council.



2.       Assessment of Proposed Driveway

A visit to the site revealed that there is an existing driveway that services the existing house on the
subject block. This house is to be retained and will ultimately be located within the new lot 1. The site
inspection also determined that the location of the existing driveway was also the most appropriate
location for the access for both lots due to the steepness of the terrain and the geometry of the road.
This means an easement would be required over lot 2 in favour of lot 1 for access purposes. The
existing driveway location is shown on the draft plan prepared by Murray and Associates reference
61500.

Given this development is in an existing rural residential area and constrained by the existing road
geometry, with tighter horizontal or vertical alignments than current design standards, we believe it is
appropriate to assess the proposed driveway against the requirements of AS2890.1:2004 – Off Street
Car Parking

AS2890 states that access driveways are to be located in a manner that provides adequate entering
sight distance for traffic exiting the property to view traffic on the frontage road i.e. Black Mountain Road.

The driver sight distances are measured, in each direction, from a point 2.5m from the road edge. When
checking the sight distances, the driver’s eye height and the height of the object (approaching vehicle)
were taken to be 1.15m above the road surface.

Black Mountain Road has a posted speed limit of 80kph however give the horizontal and vertical
geometry of the road to the west of the access point prevailing speeds are expected to be much less
than this (conservatively estimated at 60kph). Notwithstanding, the following assessment has been
based on an 80kph speed limit. As outlined in AS2890 for an 80km/hr speed limit a domestic property
access requires a sight distance along the frontage road of 95m. When looking left the sight line is
measured to the centre of the road. When looking right the sight line is measured to the edge of the
frontage road.

Tod Consulting have undertaken an inspection of the property and undertaken a physical check of the
available sightlines. A summary of the sight distances are tabulated below.




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16640_43-49 Crescent Road, Eumundi - Technical Note – Revision A