Hacker News Reader

There are expenses involved in using a road even when it's not full.

Like what? What costs more if the road has a single additional car?

The additional wear on the road.

In the UK we have only a few toll roads, and they are optional. So yes, it is entirely possible to have a road system functioning without tolls.

That's not relevant. Of course there are multiple ways to fund something. You can pay higher taxes upfront, or pay less and have the users fund it.

The question was whether tolls are inherently immoral.

Not for non-commercial traffic under a set weight limit. Toll roads are the devil.