This is allocating wear and tear on scarce highways. Dividing it evenly by use. Poor people who would never drive on this road should not be subsidizing the use by software engineers, for example (the non-toll model).

> for example, software engineers a shorter commute on average than teachers?

Housing prices already have this kind of effect -- highly compensated employees can afford to live closer to their preferred locations. There's no reason not to allocate road resources to the users who are willing to pay for them (which is a much broader segment of the population than just software engineers). Pricing is a better system than road communism.