1) I don't consider relevant to the discussion at hand.
2) I agree there are some positive externalities to roads that have not been taken into account. However, checking the PTUA figures carefully they have been careful to exclude the minimal use of roads by public transport (e.g., in land use values) and have adopted the minimum of estimates.
Where it is not the case, I think it would be relatively easy to calculate the relative costs - simply by counting the number of public versus private vehicles over a period of time on a stretch of road (adjust for tonnage if one likes)! I would be surprised if it was greater that 5%.
Re: Eh?
1) I don't consider relevant to the discussion at hand.
2) I agree there are some positive externalities to roads that have not been taken into account. However, checking the PTUA figures carefully they have been careful to exclude the minimal use of roads by public transport (e.g., in land use values) and have adopted the minimum of estimates.
Where it is not the case, I think it would be relatively easy to calculate the relative costs - simply by counting the number of public versus private vehicles over a period of time on a stretch of road (adjust for tonnage if one likes)! I would be surprised if it was greater that 5%.