A9 Dualling Perth to Inverness
Scotland, UK · 2015–2035 (estimated completion) · £3 billion (overall program estimate)
The judgement call
Account-gated at launchThe project is a long-term commitment by the Scottish Government to improve safety and journey times on a critical route. - Phased delivery approach to manage complexity and funding. - Recent move to a £1.94bn framework for the remaining sections to accelerate delivery. - Focus on improving journey time reliability and economic growth.
Key engineering challenges
Upgrading a long stretch of existing single carriageway to dual carriageway while maintaining traffic flow. - Working through diverse and often challenging Scottish terrain and weather conditions. - Managing environmental impacts in sensitive areas. - Coordinating multiple phases and contractors across a large-scale, long-term program.
Project facts
- Client / owner
- Transport Scotland
- Lead contractor
- Various (framework approach, e.g., Wills Bros for Tay Crossing to Ballinluig section)
- Lead designers
- Various
- Project type
- upgrade
- Scale
- 83 miles (133 km) of road upgraded from single to dual carriageway.
- Disciplines
- civil; structural; geotechnical; environmental; transport planning; traffic management
- Standards & frameworks
- NEC; DMRB; CDM Regulations (Scotland)
Sources: Transport Scotland (https://www.transport.gov.scot/projects/a9-dualling-perth-to-inverness/) - A9 Dualling Programme (https://www.a9dualling.scot/) - New Civil Engineer (https://www.newcivilengineer.com/?p=301543) - BBC News (https://www.bbc.com/news/articles/cvgz2g8rz7no)