Sunshine Butterflies - Attachments A - C - 010816

2.       Safe Intersection Sight Distance (SISD)

SISD is the minimum distance which should be provided for a driver on the major road to observe a
vehicle on the driveway approach. This distance should also be provided to drivers of vehicles stored
in the centre of the road when undertaking a crossing or right-turn movement. SISD is measured
from driver’s eye height (1.1m) to a point at 1.25m height (top of car).

                               Approaching from Cooroibah             Approaching from Tewantin
                                     (1.5% up grade)                      (1% down grade)
                              Austroads                             Austroads
                                                Achieved                              Achieved
                             Requirements                          Requirements
   Safe Intersection Sight
                                 293m *             >320m             308m *              >320m
      Distance (SISD)
* Note: The required sight distances vary for each of the approaches due to grade correction factors.

3.       Minimum Gap Sight Distance (MGSD)

MGSD is the minimum gap in traffic that drivers are prepared to accept when undertaking a crossing
or turning manoeuvre. It should be noted that no grade correction factor is necessary for the
calculation of MGSD. MGSD is measured from driver’s eye height (1.1m) to a point at 0.65m height.

                                     Austroads
                                                                          Achieved
                                    Requirements
                                                         Left Hand Side           Right Hand Side
     Minimum Gap Sight Distance
                                        153m                 >153m                    >153m
             (MGSD)




                             Photo 3: View to left when exiting driveway



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Tod Consulting Project No. 16520