Not sure if this is the right place to post but...
From
Highways Magazine Delayed report gives smart motorway negative benefit cost ratio
National Highways has been forced to release two key reports on smart motorways following a Freedom of Information request from Highways.
These include a five-year post opening project evaluation that showed that a scheme on the M1 is on track to have negative journey time benefits of nearly a quarter of a billion pounds over 60 years rather than forecast benefits of nearly £1bn.
Overall, the scheme is forecast to have a benefit cost ratio of minus 0.8, compared with a forecast of 1.4, meaning that the scheme is making things worse in terms of monetised benefits while in operation.
It reports that a review of the smart motorway work on the M1 Junctions 10 to 13 completed in 2012, found that instead of the predicted Benefit Cost Ratio (
BCR▸ ) of 1.4 it had a BCR of -0.8 meaning that there were negative benefits.
Perhaps this will cause a rethink as the roads lobby tries to defend such projects.
Edit: Minus inserted before 0.8