Att 2 - Traffic Plan

34 Elm St, Cooroy


Table 4 – Design Parameters for EDD Analysis

                         Observation time         Reaction time (from        Longitudinal        Design speed
                       (from Austroads part        Austroads part 3          deceleration          (km/hr)
      EDD case
                          4A App 1 section        Appendix 1 section             (d=)
                               A.2.4)                    A.3.4)

   Base case (car)
    (norm-day)
                            2.0 seconds               1.5 seconds               0.46                 25
      (normal
    conditions)

  Check Case (car)
                            2.0 seconds                                         0.41                21.251
    (mean-day)                                        1.5 seconds

  Base case (truck-
                            2.0 seconds                                         0.29                 222
        day)                                          1.5 seconds

1. The design speed for the check case (car) (mean-day) has been set at 0.85 of the assumed 85th percentile speed for
a car as suggested in Austroads, Part 3 - Table A3.
2. The 85th percentile design speed for trucks approaching from the north has been assumed to be 22 km/hr. This
assumption has been determined using Table C 3 of Austroads Part 4A Unsignalised and Signalised Intersections for a
turning radius of 15m with a superelevation of 6%.



A summary of the EDD analysis for cars is shown in Table 5 and for trucks is shown in Table 6.

Table 5 – Summary of EDD for cars sight distance requirements

                                       Design                           SISD (Minimum) from
                                                                                                              Sight
                                      Speed for                                                             Distance
                                      base case     Estimate    SISD=((DtxV)/3.6)+v^2/(254x(d+0.0
                                                                                                           accounting
                                                    Longitudi    1xa)) (m) (from Austroads part 4A
         Approach Direction                                                 section 3.2.2)                     for
                                       (design         nal
                                                                                                           vegetation
                                      speed for      Grade
                                                                                                            removal
                                     check case)       (%)      EDD Base Case          EDD Check Case
                                                                (norm-day) (m)         (mean-day) (m)           (m)
                                          km/h

                                            25
    Exit Only Access – West (veh
                                                        -2              30                  25                  36
     travelling south on Elm St)
                                       (21.25)




360 Civil Consulting - Traffic Assessment                                                         Page 11 of 22