Includes occupancy, value of time and non-fuel costs from
WebTAG. The impact on other traffic is ignored.
Value with discounting over 60 years (same as
M4 J16), ignoring ongoing maintainance costs.
The wider economic impact is ignored.
For comparison, Silvertown Tunnel has
BCR 1.7 and M4 J16 has BCR
11.1.
Assuming busses run at
Assuming construction costs of