That's the main question - it's not really known. I've seen pictures of major stations deserted in the rushhour as well, but not seen anything about whether the network suddenly empties at about 9 am.
Employers need to take actions that are well within their control and well within the capabilities and willingness to comply, of their employees.
You could lower the number of people travelling to work in the mornings and evenings if employers exercised a staggered working schedule arrangement.
Reduce the number of staff in a building at any one time. You can still keep a place functioning. Reduce the tables and chairs from canteens and encourage staff to stagger breaks.
Not everyone can work from home, but there are sensible ways to reduce risks and enact social distancing.
The only real alternative, and what is probably coming for us all, is a total lock-down, that is properly overseen by law enforcement.
In the Western world this is difficult and costly, but I wonder if in the long run would it be the most economical?
On a different note, I noticed a big shift in the language being used on Irish News reports last night. Because of the fear for mental health, it was being stressed by experts that social distancing is a misnomer. You can and should still stay in contact with people, you can talk to people but should physically distance yourself from them (2 metres).
The manner of how the virus spreads was explained using terminology that has been repeatedly heard in the media.
Aerosol - is the vapour from people coughing and the reason you should maintain a two metre distance.
Droplet - is people sneezing into their tissues etc. Minute droplets of mucous can get on the hands and are then transferred to other surfaces and can be spread that way.
Airborne - is extremely unlikely as it only survives a couple of hours.