TfL Ref: 2411-2324
Thank you for your request received by us on 3 October 2023 asking for information about the traffic lights at the junction of Ron Leighton Way and St John's Road, following your previous request for information, TfL Reference: 0656-2324.
Your request has been considered in accordance with the requirements of the Environmental Information Regulations and our information access policy. I can confirm that we hold the information you require. In response to the reply given to your previous request for information, you have asked about the following:
I have tried to summarise below my understanding of the position as it was on 13 December 2019. I have put in red text what I am particularly unsure about and would be grateful for your comments please
3.If a pedestrian presses the button, then the pedestrian will get a green light. (Stage 3) lasting for [ please see B8 below] but the timing of that light is dependent on when in the signal cycle the bottom has been depressed [see B4-7 below].
B. Timings
4.The waiting time for a pedestrian who has pressed the button is variable depending on when in the signal cycle the bottom has been depressed.
5.The maximum wait for a pedestrian who has pressed a button is 72 seconds before the lights turn green in their favour, if the button is pressed immediately the green man has been extinguished.
Please refer to Point 7 below, which details the maximum wait time for pedestrians.
6.The minimum wait time for a pedestrian who has pressed the button is 0 seconds.
This is on the basis that a pedestrian arrives when Stage 3 has been demanded. However, if you were the only person to push the button and you arrive in the demand window of the cycle for the pedestrian stage, you would wait for the following on a move from the side road: (Stage 2) to pedestrian (Stage 3) – Phase F = 5 seconds, Phase E = 8 seconds and Phase D = 9 seconds.
If the move is from the main road (Stage 1) to pedestrian (Stage 3), you would wait for the following: Phase F = 9 seconds, Phase E = 8 seconds and Phase D = 8 seconds.
7.The average wait time for a pedestrian who has pressed the button is 46 seconds. [ Have I understood this correctly?]
The average waiting time for Pedestrian Phases D, E and F respectively, at this time and on this date, we believe to have been 39s, 41s and 38 seconds respectively. This is half the maximum possible waiting time for each phase respectively, i.e. 78s, 81s and 77 seconds; based on maximum cycle time minus the pedestrian green figure duration.
8.If a pedestrian presses the button this operates Stage 3.
Yes, it puts in a demand for Stage 3.
A. Does that start the full pedestrian sequence of Phases D, E and F?
Pressing a push button for either Phase D, Phase E or Phase F, inserts a demand in the signal controller for Stage 3 – the Stage will start once Stage 1 and/or two have been serviced and safety critical timings between Phases. B. Is this sequence cumulative, so it will last a total of 28 seconds? Or is it only the phase which is applicable to the button which has been pressed – e.g. if the button by SJR is pressed then does Stage 3 last 11 or 28 seconds in total?
Whichever push button is pressed will call Stage 3, (a minimum of one demand from any push button is required) – the Stage will run the invitation to cross - green figure - which varies depending on the Phase. Hence, Phases D, E and F should last 10 seconds, 7s and 11s in parallel and not a cumulative time.If this is not the information you are looking for, please do not hesitate to contact me.Please see the attached information sheet for details of your right to appeal as well as information on copyright and what to do if you would like to re-use any of the information we have disclosed. Yours sincerely Jasmine HowardFOI Case OfficerFOI Case Management TeamGeneral CounselTransport for London