The problem is that even if correct it will be misinterpreted. Basically it is saying don’t ride or run as a group slipstreaming, go side by side. You are not allowed to ride as a group anyway. The public will read headlines like “2m not sufficient social distancing for runners and cyclists” and think runners and cyclists need greater clearance and can more easily spread to pedestrians. If anything, if this study is true, then it is the opposite, the droplets are constrained to a narrow but longer area pulled along in the slipstream following the runner or cyclist, where a pedestrian cannot be unless they have just been run over or had a very close pass.
So if it is true, assuming you are following the rules on group exercise - no slipstreaming, then the takeaway is :-
When shopping it is occasionally necessary to pass in an aisle within 2m. The is safest done running as it will narrow your droplet cloud and suck it along behind you protecting the other shopper. If other shoppers are selfishly walking or worse standing still, producing omnidirectional 2m droplet clouds, hold your breath whilst running by and only shout at them to point out their selfishness once safety has been reached. This would also reduce the total time shopping and queuing to get in. supermarkets, please introduce minimum speed limits.
Don’t be selfish - keep your droplet clouds narrow.
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