Agreed that there is more active travel in the Netherlands, but (a) they own more cars than in Ireland (520 per 1,000 inhabitants (NL) vs 446 per 1,000 inhabitants (IE))
Motorisation rates in the EU, by country and vehicle type - ACEA - European Automobile Manufacturers' Association and (b) impose higher external costs (13,396 Mio€ (NL) vs 2,890 Mio€ (IE)), as per the report referenced by poster Concrete in post #30 above. So they don’t have a lower social cost of car usage. I doubt their citizens are healthier, as e.g. they have a higher smoking rate than Ireland.
One reason there is less congestion is because NL and equivalent EU countries such as BE have better transport infrastructure than IE. Our infrastructure is positively primitive. For example, Ireland has 663 km of motorway, which puts us as the 47th country in the world in terms of motorway infrastructure. To put this in perspective, we have just 30 km more motorway than the workers’ paradise of Cuba! https://www.nationmaster.com/country-info/stats/Transport/Road/Motorway-length (All countries compared for Transport > Road > Motorway length (nationmaster.com)). Equivalent EU countries such as BE has 1,763 km of motorway, and NL has 2,274 km. So NL a country that is 59% the size of Ireland has 343% more motorway kilometres than IE. BE a country that is 44% the size of Ireland has 166% more more motorway kilometres. Cars are not a problem in Ireland; and a spendaholic vanity project like free state transport is just market-rigging on favour of the state sector.