07/2398 - Request for information response [As Published] · 132007.2398

 

 

3.

As noted in our response dated 20 November to the Council's information request
dated 4” October:

As summarised in Table 3 and 6 of the traffic report (Ref 1) the aaSIDRA analysis of the
Elm Street / Diamond Street unsignalised T-intersection indicated that the intersection is
expected to operate within acceptable operational limits (i.e. Degree of Saturation < 0.8)
during the 2010 AM and PM road peak penods, albeit with an average delay for the
right tum movement from Diamond Street into Elm Street of approximately 40 seconds
and a corresponding 95%ile queue length of approximately 3 vehicles (20m) during the
AM peak.

While the Level of Service (LOS) ‘E’ for the nght tum movement during AM peak is a
reflection of duration of delay for this movement the volume of traffic affected is only
approximately 17% of the total volume approaching the intersection from Diamond
Street.

When considering both the left and rnght tum movements the aaSIDRA analysis :
indicated a LOS ‘C’ for the Diamond Street approach which is within acceptable limits. d

Prior to 2020 the Diamond Street / Elm Street intersection would exceed its operational

capacity and for this reason it is expected that this intersection would need to be

signalised prior to 2020. As summarised in Table 9 of the traffic report (Ref 1), the Elm .

St / Diamond St signalised intersection would operate satisfactorily with additional traffic ~~"
generated by the proposed development. Further, the addition of traffic generated by

the proposed development would only increase in the Degree of Saturation of the critical

movement by 0.01 which is considered to be negligible.

On the basis of the above the predicted traffic outcomes for 2020 are not considered
errant given the intersection needs to be signalised prior to 2020 without the proposed
development,

Council's concern appears to relate to the issue that the intersection is currently experiencing
congestion and delays.

In response to this issue it is unclear whether:

x

the delays are being experienced occur during the afternoon (ie school) period which is
outside the period required to be considered by the Applicant; or

the delays which would be a short duration (ie Smins) and would not be expected to
exceed more than 3-4 vehicles during the AM and PM road peak periods (which is
within acceptable DMR limits, albeit at the upper end of the threshold) are being
perceived by local motorists are unacceptable.

Regardless the assessed performance of the intersection is within acceptable limits.

 
   

 

weew.mrcagney.com consultants in transportation

3427-002(1) - AFI.doc