Dramatic changes to the way we tax motoring. The principle being the road network being entirely funded by its users.
Much as though it is not believed by many on this forum, the road network is entirely funded by its users many many times over in cash terms, through VED, fuel duty, VAT and tolls. That even allows for most external costs such as accidents, ill health through air quality and so on.
There is, as you point out, an imbalance between infrequent users and heavy users, particularly HGVs.