in our county.. when the road maint dept charges for road work in private subdivisions.. etc. owners are billed straight frontage.
if it's a 1k' road and the 5 people each see 200' then divide by 5. that's how our area does it anyway.
think about it like this.
say each owner only ever uses his section.. never any past him.
the guy at the front uses less.. however his piece gets used the MOST.. the guy inthe back uses the entire road.. but the piece in front of him is used the LEAST. You could asusme the piece used the most will wear the most.. and the piece use dthe least will wear the least.
thus a even distribution of cost is plenty fair