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A trope that keeps coming up when discussing escalators serving railway stations is “LONDOn DiD a sTUDY ANd ThEy foUnD iT Is mORe efFIcienT tO sTANd ThAn wALk up ThEM”. But the truth – while London Underground did do such a study that found that, the escalators you are debating probably don’t look like those the findings relate to.
Photo by Adrian Boliston, via Wikimedia Commons (CC-BY-2.0)
The backstory
The London Underground study hit the news back in 2016 – here is a piece by BBC News when it was first released.
Holborn Tube’s standing-only escalators ‘quicker’
20 January 2016A trial in which Holborn’s escalators became standing-only improved the speed customers got through the station, Transport for London (TfL) has found.
During the three-week experiment people were asked to stand and not walk while travelling on escalators to the ticket hall between 08:30 and 09:30.
Queuing was reduced and 30% more people used the Tube’s escalators during the trial, analysis showed.
The station also shut only once because of overcrowding, compared to the more usual several times a week.
As well as an important qualifier to the study everyone seems to miss – how long the escalators involved on the trial were.
Research by London Underground (LU) found people tend to stand when escalators have a height of over 18.5m, leaving empty space on the left side.
By making them standing-only, the test showed 16,220 people could travel on Holborn’s 23.4m high escalators during rush hour, compared to 12,745 in normal circumstances.
A Transport for London press release going further into the findings of the trial.
Results of three-week trial:
- Before the previous trial, calculations showed the Holborn escalators would normally each carry around 80 people per minute, with more standing than walking. Theoretically LU expected to see this rise to more than 110 people, with the escalators filled with standing passengers on both sides
- The results exceeded expectations, with a recorded increase of 30%. An escalator that carried an average of 2,500 customers between 8.30 and 9.30am on a normal day, carried around 3,250 when it was designated standing only for the same five-day period
- ‘Station control’ – temporarily preventing customers from entering the station because of crowding – was only implemented on one day during the first week of tests and not at all in the other two weeks. Prior to the tests implementing station control was something which happened several times a week. This is a good indicator that flows had improved.
With the raw data found in TfL’s Report on Holborn Pilot for Standing on Both Sides of Escalators published in January 2016.
A pilot was carried out at Holborn Station on London Underground for standing on both sides of escalators exiting the station.
The aims were: to look at safety by reducing slips, trips and falls; to reduce congestion by using the escalators more effectively; and, to change customer behaviour. The data collected was both qualitative and quantitative.
Which went into the maths of passenger capacity – walking is faster than standing.
LU escalators have a speed of 0.75m/s and a step height of 0.4 m which gives the number of steps/minute as 112.5. With customers standing on both sides of the escalator and occupying every step this gives a theoretical maximum of 225 customers/minute. However, looking at the right hand, stand only, side; and taking into account the empty step previously discussed, this gives a capacity of 56.25 customers/minute.
On the left hand, walking side, with an assumed walking speed of 0.5m/s, an escalator speed of 0.75m/s gives a walking speed of 75m/minute. Given a step rise height of 0.4m this gives a walking speed of 187.5 steps/minute. Taking into account the two step vacancy described by Fruin for stair walking, the speed for walkers on the left hand side of the escalator is calculated to be 62.5 customers/minute.
And the important part – how the height of the escalators reduces the number of passengers who attempt to walk up them, resulting in an empty ‘walk’ lane that could be better used by standing passengers, which then makes standing the more efficient option.
These calculations do not take into account the vertical height of escalators. It is assumed for the purpose of this calculation that there is a decreasing percentage of passengers willing to walk up a high machine.
The percentages given below are partly based on observations at Canary Wharf with a 10m vertical rise, together with observations of customer walking behaviour on escalators with a greater vertical rise than 10 metres. The graph below shows vertical height vs % of passengers willing to walk. At Holborn the escalator rise is 24 m which gives an estimated amount of 40% of customers willing to walk.
% of Passengers Vertical height (m) 100 5 100 10 90 12.5 80 15 70 18 60 20 50 22 40 24 30 26 20 27 10 28 0 30
Which leads to their conclusions.
The tests at Holborn were successful in easing congestion and improving customer flows. However, the tests required a large number of staff to implement, which is not viable on a daily basis. This is a consideration in how to take this forward.
Customer behaviour was only changed for the duration of the tests, with “normal” escalator usage resuming immediately that the tests were over. Some strong emotions were displayed by customers who wished to continue in their habitual routines, although most customers were compliant. A significant number of comments related to the wish to have at least one “walking” escalator for the purpose of speed, exercise and in case of lateness.
The most important one being.
It is clear that implementing “standing only” escalators would not be suitable for all locations given that shorter escalators achieve greater efficiency when walking is permitted.
Yes – providing everyone is doing it, walking is more efficient than standing on an escalator!
Some Melbourne examples
The escalators at Flinders Street Stations have a vertical rise of only 5 metres or so – so almost everyone chooses to walk up them.
The ones at Southern Cross Station are a little longer at around 8 metres high – but lots of people still choose to walk up them (when they are working!)
But the deep level Parliament station is where people decide against walking – the longest escalator there is 30 metres long, which at the standard 30° inclination is a 15 metre rise.
And the new longest escalators in Melbourne are at the Franklin Street exit from State Library station – at 42 metres long they rise 21 metre from the intermediate mezzanine to street level.
Luckily this end of the station is quieter than the shorter escalators serving the main Swanston Street exit and interchange with Melbourne Central station.
Further reading
Deepest stations on the London Underground
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The post That standing is faster than walking study from London isn’t really relevant to your escalators appeared first on Waking up in Geelong.











































































































































































