Question: If I am traveling to a mass gathering, what are the risks of traveling by public transportation?

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: What factors should organizers and health authorities look at when assessing whether the risks are acceptable or not?
section_content: For countries not currently known to be experiencing community transmission of
COVID-19, the priority consideration will be whether the planned mass
gathering event substantially increases the risk of the virus entering the
country and becoming established, as well as the risk for participants to
importing infection back to their home country and further increasing global
spread. In making this assessment, the organizers and their national or local
health authorities should recognize that the risk of imported cases of
COVID-19 is naturally linked to international travel. They should also
recognize that it is neither realistic or desirable to aim for zero risk. When
organizers and health authorities are determining whether to hold a mass
gathering, they should determine what is an acceptable risk and what
additional measures should be implemented to mitigate the risks.
For countries where COVID-19 has already started to spread in the community,
key consideration will be:

aiming at containing or at least slowing down the spread of the virus in the local community/country.
preventing participants from other countries being infected with COVID-19 

In each case the risk should be considered in the context of the known
features of COVID-19, its severity, its transmissibility and the effectiveness
of measures to prevent or reduce transmission. The strain already placed on
the local health system in responding to COVID-19 outbreak(s), and the
additional strain the mass gathering might place on the system also need to be
taken into account.
You can find more advice on what to look at in the WHO document Key planning
recommendations for Mass Gatherings in the context of the current COVID-19
outbreak of 14 February 2020. See: https://www.who.int/publications-
detail/key-planning-recommendations-for-mass-gatherings-in-the-context-of-the-
current-covid-19-outbreak

Reviewer feedback on this answer:
Talks about the risks associated with mass gatherings, but doesn't talk about mass transportation.
This information is irrelevant to the question. This information is explaining about the risk of planned mass gathering and the risk of imported cases of Covid-19 due to international travel and the question is asking about the risks of travelling to a mass gathering by public transportation.

Reviewer ratings:
Bad
Bad

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: How large does a meeting or event need to be in order to be a “mass gathering”?
section_content: High profile international sporting events such as the Olympics or World Cups
as well as international religious events such as the Hajj count as mass
gatherings. However, lower profile conferences and events can also meet WHO’s
definition of a mass gathering. An event counts as a “mass gatherings” if the
number of people it brings together is so large that it has the potential to
strain the planning and response resources of the health system in the
community where it takes place. You need to consider the location and duration
of the event as well as the number of participants. For example, if the event
takes place over several days in a small island state where the capacity of
the health system is quite limited then even an event with just a few thousand
participants could place a big strain on the health system and then be
considered a “mass gathering” event. Conversely, if the event is held in a big
city in a country with a large, well-resourced health system and lasts just a
few hours, the event may not constitute a “mass gathering” event.

Reviewer feedback on this answer:
Defines a mass gathering, but doesn't mention public transportation and the associated risk.
This answer is irrelevant to the question. The question is asking about the risks of travelling by public transportation to a mass gathering. However, the answer provides information of what types of events are considered as mass gathering.

Reviewer ratings:
Bad
Bad

Answer passage (source: WHO):
page_title: Q&A: Mass gatherings and COVID-19
section_headers: What are the risks arising from public transport to the venue(s)?
section_content: The extra risk from participants and spectators travelling on public transport
in a major city may not be significant compared to the ongoing risk to the
local population using the transport all the time if physical distancing is
not possible on public transport.

Reviewer feedback on this answer:
Gives a clear answer about the additional level of risk associated with public transportation.
This answers the question directly by providing information on the risks of travelling on public transport to a mass gathering event in a major city.

Reviewer ratings:
Excellent
Excellent