Condition assessments will be performed on all the tunnels and recommendations provided for all disciplines. The Norwegian Public Roads Administration will determine the scope of the renovation work it would like to see performed. This will be looked into in the detailed design phase, when the tender documentation and later the basis for work will be prepared. Renovation work also entails close supervision during the construction period. Essentially, all technical equipment will be replaced. This is because the remaining lifespan on some items is too short and/or new requirements are applicable or new systems available. Technical buildings in all the tunnels will be extended. Contracts in which all the work is performed at night, with traffic operating in the tunnels during the day, mean that the replacement of technical equipment requires a sharp focus on the implementation strategy.
