That might work if you were dealing with a Gas, Octy. However, the virus is spread through droplets which are a Liquid.
It's beyond dispute that a taxi operator can comply with more of HSE's suggested social distancing measures than supermarkets. The suggestions are published, it's all there in black and white. A taxi operator is also far better placed to manage the risk as he comes into contact with far fewer surfaces.
I was in a lot of shops, not just supermarkets, last Thursday and there were plenty of people wondering round picking stuff up, putting it back down, etc... You might wonder why this is allowed because you clearly haven't understood a word of what Govt/HSE have told you they are trying to do i.e. slow the spread of the virus. Nobody is trying to stop the virus. The consensus is that it must spread to build immunity within the community and to get rid of it. If we went into lockdown with food delivered by suitably attired officials/soldiers the virus would never go away, it'd just wait for us to end the lockdown.
Given the 14 day incubation period the effects of social distancing will only start to reckoned this week. Govt can then decide if further restrictions are required depending on it's targets and projected progress towards the same. I expect we will see further measures to tackle large numbers of people visiting relatively small areas e.g. parks, nature trails, etc. However, there will still be a requirement for folk to get out and spread the virus so it's unlikely supermarkets will be closed.