You're misunderstanding my point. Transport subsidy funded from current income is a good idea. Spending your entire capital infrastructure budget on making it free for a few years is not. The 'lingering benefits' don't linger long if you then have to hike fares massively because you've got a big loan to repay as a result with no new assets you can exploit to service it.
It's for this reason that saying 'we could spend the money on making buses free for a N years' is meaningless. It would be more sensible to say 'we should spend the £Nbn we spend on maintaining the motorway network on free buses' because those types of spending are equivalent.
But it would only decrease traffic and pollution for the duration of the spend. Once it's over, those benefits stop and there is nothing left beyond the lingering effects of the intervention.
It's actually worse than that, because you've essentially taken out an unsecured loan of £100bn and spent it on something which neither increases ongoing tax revenue or asset value, so you now have to cut other spending to pay it off. Which is why governments and businesses separate capital expenditure (building things) from current expenditure (doing things) very carefully.
Nobody who says we can get 'improved rail' for the cost of HS2 had ever explained how we get that in the vicinity of London without something which looks extremely similar to HS2. We have solid proposals for 'improving rail' from the rail industry, and HS2 is the bedrock of it all. Where's the silver bullet hiding?
This was the first thing I thought of when I read this question. So often I find myself and people around me basically assuming that the folks on the other side of the phone are idiots. Well, chances are they're thinking the same. You only need 15 minutes to disagree, but it takes much more time and effort to humbly understand a stranger's worldview and motivations. However, once you do, you're much more likely to deliver something you're both happy with at the end.
I think this is a significant part of the value of face-to-face meetings - it's much easier to 'get' someone when you observe and speak to them and their colleagues. At the very least, the connection you get makes it harder to subconsciously write them off as an idiot!
Of course, occasionally you come across people who really are very unsuited for the task at hand and end up talking total rubbish. But it's still worth taking the time to be sure - it's probably not as obvious to you as it is to other people, and you'll find yourself having to justify your assessment more often than you expect, particularly to decision-makers.
"Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2),"
and it is backed up by a WHO factsheet https://www.who.int/emergencies/diseases/novel-coronavirus-2...