What impact each project listed in the Scottish motorway and trunk road programme will have on greenhouse gas emission levels.

The principal greenhouse gas emitted by traffic using trunk roads and motorways is carbon dioxide. An assessment of the emissions of carbon dioxide from traffic predicted to use new trunk road projects is usually undertaken as part of the environmental impact assessment of the road proposals. These assessments are based on traffic modelling for the schemes which predict changes in traffic flows, and report emissions as a change in the quantity of carbon dioxide compared with the predicted conditions without the new or improved road in place. The findings of these assessments are presented in the environmental statement (ES) for each project which is a public document.
Information on carbon dioxide emissions is not available for all projects in the motorway and trunk road programme. A number of smaller road improvement schemes do not significantly change traffic flows and have a negligible effect on emissions. Also, several schemes are still in preparation and have not yet reached the ES stage. A summary of information for the projects in the programme on which information is available from the relevant ES is presented in the following table.
Route
| Project Name
| Estimated Carbon Dioxide Emissions*
(t.p.a.)
| Assessment Year

A876
| Upper Forth Crossing at Kincardine
| 7,524
| 2021

A75
| Overtaking Opportunities
| 32
| 2021

A830
| Arisaig to Loch nan Uamh
| Reduction of 70
| 2021

A9
| Ballinluig Junction
| 181
| 2022

M74
| M74 Completion
| 134,800
| 2020

A7
| Auchenrivock
| 130
| 2006

A77
| Park End to Bennane
| 3
| 2008

A76
| Glenairlie
| 105
| 2007

M74
|