This proposed route runs from Thorness to Lepe. It requires 7km of road, 3km of tunnel and 2km of bridge.
Here are the sources:
Costs of widening or building highways (excludes land costs), as at 2005:
A single carriageway has been chosen as the flow won’t be ‘lumpy’ like ferries. The most expensive is coded at D3MWID at £4m per lane, per KM.
And we need to add in land purchase costs, which is only a couple of KM from the bend at Thorness to the sea – that’s at Savill’s average land value as at this month of £10k per acre…. And we need under five acres to do what we need, so let’s say £100k to cover that (hint – the land purchase cost here is pocket change).
The route across the seabed would need to be arranged with The Crown, which shouldn’t be too difficult to get agreed.
Costs of bridges on page 18, as at 2006:
Which gives up £2,125 per M2…. That’s in square metres for the deck so I needed to grab the carriageway widths from here – we’ll go for 6.75m wide:
And the tunnel…. using the Limerick costs for comparison – £322m for 675m of tunnel. In this situation we need 3km of tunnel at £477k per metre
So the final bit is to add on inflation for the historic costs, for which I used this: http://www.thisismoney.co.uk/…/Historic-inflation-calculato…
So, let’s roll the figures (I’m going to work in round millions):
7km of roads being upgraded, or laid: £72m
3km of tunnel at £477k per metre: £1,431m
2km of bridge at 6.7m wide deck: £37m
So, this gives a grand total of £1,540m for the project.
Amortise that over 50 years – £30.8m cost per year, plus maintenance, but we’re not building a high maintenance structure here – we’re going practical – maybe we should fit tidal turbines to generate electricity to pay for the maintenance?
Let’s define the crossing at a charge of £20 each way toll.
Use the Red Funnel stats on the Car Equivalent Units (CEU)they move each year, which are available here:
This gives 1,038,910 CEUs available, with a utilisation of 44.5% (463,315 units moved each year). We know their route recently passed Fishbourne as the most popular, so they’re going to be moving about the same number of CEUs and that needs to be topped up with some more CEUs for the Yarmouth route, so we’ll work with a round figure of 1.5m CEUs moved per year.
So, conveniently, those 1.5m vehicle movements, at £20 a go pops out at £30m income per year, so if we run the project in the public domain it could be entirely feasible.