4895_RAL20-0020Response

RAL20/0020 Reconfiguration of a Lot: Response to Information Request – Report                      7


AGRD Part 4 section 3.4 Sight Distance at Property Entrances describes the process for
design compliance in more detail. Sight distance is defined in three ways:

     •   Approach Sight Distance (ASD)
     •   Safe Intersection Sight Distance (SISD – the basis of SSD for the standard drawing)
     •   Minimum Gap Sight Distance (MGSD)
Safe Sight Distance tabulated on RS-056 Driveways – Rural Driveways is described as
SISD in AGRD Part 4 2017 using a conservative observation time of 3 seconds, a
deceleration coefficient of 0.36 and a reaction time of 2 seconds. ASD is not relevant, as it
relates to sight distance for approach to the intersection with the major road: a driveway user
is already aware of its access point.
For property entrances, AGRD recommends a minimum compliance with MGSD and
Extended Design Domain (EDD) values of SISD base cases. These are referred to where
the general SSD compliance with RS-056 Driveways – Rural Driveways is not met.

4.1.2.2 Site access: Lot 429 MCH481 (existing)

4.1.2.2.1 Sight distances
Approximate sight distances for the existing access driveway were taken off Noosa Council
mapping using measurement tools to dimension sight lines according to the SISD
measurement reference points shown in Figure 3 above.
The sight distance from an entering driver’s reference position to the centreline of an oncoming
lane is shown in Figure 4 below.




Figure 4: Approximate sight distances from driveway access to existing Lot 429 MCH481.




                                                                                         Long View
                                                                                         Consulting Engineers