Appendix H Traffic Impact Assessment · RAL25/0004

the road to approximately 360m. Both of those sight lines exceed the Austroads Safe Intersection Sight
Distance (SISD) requirement of 151m for a 70km/h design speed.

The Swift Rd / Lake MacDonald Dr intersection includes a short passing lane in Lake MacDonald Drive
to enable north-eastbound traffic to pass to the left of vehicles turning right into Swift Rd, as shown on
the aerial photo at Figure 4. Sight distances from Swift Rd toward the east along Lake MacDonald Drive
are restricted by the vertical alignment of the road to approximately 155m, and toward the west by the
horizontal alignment of the road to approximately 300m. Both of those sight lines satisfy the SISD
requirement. There is no history of crashes recorded at the Swift Rd / Lake MacDonald Dr intersection.




Figure 4: Existing Swift Dr / Lake MacDonald Dr intersection


The Swift Rd / Cooroy Noosa Road intersection includes right turn lanes in Cooroy Noosa Road as
shown in the aerial photo at Figure 5. Cooroy Noosa Road has a sign posted speed limit of 80km/h at
the intersection. Sight distances toward the east from Swift Rd significantly exceed the Austroads SISD
requirement of 214m for a 90km/h design speed. The sight line available to vehicles waiting to turn right
into Swift Rd from the east is restricted to just over 220m by the horizontal alignment of Cooroy Noosa
Rd west of the intersection, and for vehicles waiting to turn left from Swift Rd toward Cooroy Noosa Rd in
the east, the available sight line is improved to approximately 260m due to the configuration of the road
configuration. Thus, the available sight lines satisfy the SISD requirement.

Review of the accident history at the Swift Rd / Cooroy Noosa Rd intersection indicates 3 similar
accidents in 2001/02 all involving a through vehicle along Cooroy Noosa Road colliding with the rear of a
vehicle waiting to turn right into Swift Rd. When those accidents occurred there were not any turn lanes
in Cooroy Noosa Road intersection, with turn lanes that are now in place at the intersection being
implemented between 2003 and 2006, presumably in response to the earlier crash history.




24.s.70.1                                         Page - 4