Currently we have a disabled class for the road fund licence, the idea being that we can’t simply use public transport or walk everywhere because of our disabilities. Will that be carried over to road pricing?
We also have exemptions from congestion charging & some toll roads (e.g. Dartford Crossing), & private roads we can obtain a discounted flat rate for those who will use the road often (M6 Toll). Congestion charge exemptions cover us again because we often can’t simply use public transport.
The rural area problem already exists with the current system of road funding, & it would be interesting to see how much tax revenue rural driving currently brings in. It might not be worth charging per mile for rural roads & all the per mile taxation gets done on the trunk roads only, impacting on the already existing taxation penalty of living in rural areas positively.