The technical annex presents the methodology and findings from the pilot of the analytical framework proposed in the National Infrastructure Assessment. The objective of the pilot was to develop insights on the practical application of the framework and identify where it needed to be revised. The pilot was completed with support from Highways England. A summary report setting out the impact of the pilot findings on the Assessment proposals is presented separately. The annex presents the detailed methodology and findings of the pilot. The analytical findings have been used to populate the framework.