In most countries the maintenance costs for highways are funded from the budget of the country, and thus split on the whole population. Those amounts are not included when someone makes a cost calculation for driving from A to B, unless one has to pay for a vignette for using the highway.
Also the cost of the car maintenance per kilometer is often not taken into account.

What is also annoying is that the budget allocated for the maintenance of the railway infrastructure is in most countries a lot less than that allocated for road infrastructure, further increasing the costs of train tickets (and thus the apparent cost of train travel) when compared to road travel.

Another user that is less than 24 hours old spewing Russian propaganda bullet-points? Shocking!