Current status: Answered by Fiona Hyslop on 17 December 2024
To ask the Scottish Government how it is working to prevent closures of the Queensferry Crossing, in light of reports after recent periods of cold weather that traffic could be diverted to the Forth Road Bridge as soon as an ice forecast is received, to prevent ice falling from its cables onto vehicles.
Ice accretion is a world-wide problem affecting cable-stayed bridges in colder climates, and there is currently no effective solution for preventing it completely. While closures of the Queensferry Crossing due to ice accretion cannot be prevented entirely, we have taken forward research, which led to enhanced management procedures being developed. Now, when there is a risk of falling ice, a 6-point plan is implemented by our Operating Company BEAR Scotland. The plan includes enhanced patrols; heightened focus on prevailing weather conditions; increased data & intelligence gathering; pre-laying of traffic management and enhanced stakeholder communications.
Investment has been made to improve our capability to predict ice accretion. For example, new ice and climate sensors were installed on the bridge in August 2020. These, together with improved bespoke weather forecasts, have helped deliver early warning of conditions conducive to ice accretion. In addition, infrastructure improvements have recently been completed, which will allow traffic to be diverted onto the Forth Road Bridge more quickly.