Timing the Anzac Parade & Lang Rd/Cleveland St intersection


Having one train every 3 minutes (so 1 every 90 seconds when you take going in and coming out) does not  look workable.

It’s now clear that what RMS has said about cascading to gridlock through the entire Sydney basin .  Delays at these intersections flow into Eastern distributor, M5, Sydney Harbour Bridge, Westconnex prospectively and all major intersections eventually through peak hour.

The Federal Government traffic study on putting a few thousand people on the Bundock St/Avoca St site had it causing additional delays of up to 90 seconds at SUTHERLAND.

Cycle times frequently 2 minutes 20 seconds (140 seconds) with N traffic (into city along Anzac Parade) going for up to 85 seconds alone.  Due to time for red light runner delay and pedestrian safety (3 @ 3seconds and 1 @ 4 seconds) 13 seconds out of 60 cycle (30 trains per hour each way claimed capacity) would only leave 48 seconds for start up and stopping and pedestrian crossings.  Crossing Anzac E/W currently gives 44 seconds to walk it!  With a 60 second cycle  – and maintaining same relative time to other directions  -it would be cut it to 21 seconds.

To cycle the 4 main phases would see N cut to no more than 25-30 seconds at best so throughput volume would be cut by significantly more than 30/85 as the # of vehicles through increases the longer the light is at green (unless grid lock).  Likely a 70% cut in city bound traffic capacity!  And only 18 seconds for all E/W phases!

Even more interesting was the sheer volume of buses for Sydney Boys/girls in the morning from central.  Could have been up to 25+ (hard to tell as some changed sign to out of service instantly).  Also in one 45 approx second period there were 7 891 buses 2 of which were articulated (so 115 capacity).  Rough total 891 capacity in that period was 580 passengers to UNSW alone let alone all the 39s, 37s, 33/34s and M10.M50s vs Light Rail Train capacity for that time period of just 75 passengers (300 per 3 min/4).

Doing timing of intersections is possible on your own but very hard work with many possible phases. r = turning right, l = turning left, E = heading east from start up etc.

Need to be watching the lights changing (arrows in different directions as order changes) and watch at same time.  Some phases were changing 3 different lights over a 9 second time frame

This intersection has main phases:

  1. N/S/Sl
  2. N/Nr/Wl
  3. Er/Wr/Sl
  4. E/W/Wl

Then throw in the bus way, pedestrian crossings (N/S split into 3 phases on W side and 2 on E side).  Also the separately controlled Nl and El for good measure,

Then to complicate matters the E/W phase has several variations depending on traffic flows and crossing requests.

So there is roughly a 3-4 second delay from red before the next phase goes green.  Then there are different durations for the Sl vs the other directions for 1 & 3 as the S ped xing and bus way need to be included in the cycle.

Phase no.3 was interesting as it varied with the following combinations:


Er,Wr,Sl – all finishing at the same time

Er,Wr,Sl – Sl finishing after as few as 7s and as long as 20+, Er & Wr together

Er,Wr,Sl – Sl finishing 7-12s, then Wr finishing after 15-20+, then E starting with Er finishing a few seconds later and then W starting.

Er, Wr,Sl – Sl finishing first, Wr finishing, Er Finishing then E/W going and stopping and Er starting up again while everything else is stopped.