I saw this on the BBC News. Apparently, the person in the hazmat suit in the front seat was a special healthcare professional, who was primed ready to assist if any passenger became ill in transit.
The drivers were told that, since the passengers were behind them, there was minimal risk to their catching anything. I find this extremely bizarre. Afterwards, the drivers would be quarantined at home for 10 days. (Gaily infecting their families?!) I'd have refused this job if I'd been a driver.