The state is obligated to serve the people. The people have no obligations to the state.
Taxes only work if society accepts the morality that the government can use force to extract money from people.
For millenia people have found this to be morally acceptable and have not questioned it.
They also felt that slavery was perfectly moral because slaves were not humans.
We overcame that morally accepted practice. We can overcome taxation as it is currently enforced.
My ideal method for raising funds has always been a "membership" type of up front payment that is voluntary. You pay up front a certain amount which allows you to buy a bronze, silver, gold, platinum, etc. package. Bronze might get you just the basic necessities that a government provides such as military protection but not a whole lot. The country may even decide to subsidize the bronze members through the fees for the more expensive packages. The more expensive package might include things like health care, education (all through college), etc. These packages could even be private offerings to lump together a large amount of private services. And there could be competing industries (or blockchains) trying to get the most customers. So people are competing to give you the best government possible.
As for roads. Consider that I once mentioned ending taxes online and someone from Britain could not fathom how people would be able to pay for their dental work without taxes. I used to live in a city with private fire department and private ambulance services. Most places I have lived in the garbage company was private. These actually exist yet people cannot comprehend how they can be done without the government. If you are too mentally lazy to consider things that already exist being private then you likely cannot imagine the roads being private. What I suspect would happen would be similar to how our cell phones work. Right now there are towers owned by various companies that rent out their frequencies to cell phone companies who then sell plans to consumers. When you pick up your phone and use data, you don't care that your data is going over some third party that is a contract with another company that is paying the company of the cell tower which then transfers data to another cell tower owned by another company, and on and on, changing hands through many many different private companies. In your mind, if you had to plan it all you would just have one entity "the government" run it all and it's all simple with no need to use your brain.
Personally, I look forward to smart roads that charge your electric car as you drive while your car drives you at the optimal speed with no more car crashes all paid per meter on the lightning network. But none of that is possible if governments still hold a monopoly on the roads.