Progressive upgrading of the Hume Highway has been under way for a number of years as part of the Commonwealth funded National Highways strategy. Once committed works are complete, continuous dual carriage was will exist between Sydney and Coolac with the exception of a 19 kilometre section commencing 19 kilometres south of Yass. Completion of this section, centred on Bookham, is the next planned major work to be undertaken as part of upgrading the Hume Highway and is the subject of this environmental impact statement.