The news article:
https://www.theladders.com/career-advice/mit-researcher-says-the-6-feet-social-distancing-rule-isnt-enough-to-flatten-the-curve
The research paper:
https://jamanetwork.com/journals/jama/fullarticle/2763852
Sneeze gas cloud image:

Summary:
1. Stay at least two car lengths away from other people (think sedan not mini).
2. Wear a mask if you have to go out and expect to encounter people, or if you enter an occupied building that has a ventilation system.