Date lodged: 17 January 2018
To ask the Scottish Government what modifications have taken place in the last five years to upgrade central reservation barriers on motorways and dual carriageways to allow sections to be temporarily removed in bad weather to assist with clearing stranded vehicles.
Answered by: Humza Yousaf 30 January 2018
The provision of crossover points on a dual carriageway is dictated by national standards (Design Manual for Roads and Bridges). We continue to review our network to assess the merit of introducing new crossovers at strategic locations and wider incident response arrangements are being considered for the next trunk road maintenance contracts.
The provision of crossovers on the wider dualling programme will be taken forward as we progress future stages of detailed design. For example, for the dualling of the A9 between Perth and Inverness, demountable barriers (posts are slotted rather than driven or cast in) will be provided at cross-over points. Maintenance crossovers will be provided at regular intervals (approximately 4 km or less) and are primarily located to assist road maintenance operations but also help to control traffic during road incidents. Winter resilience mitigation measures such as planting of shelter belts, snow fences and earthworks profiling will also reduce the effects of drifting snow and improve snow clearance operations.
For the dualling of the A96 between Inverness and Aberdeen, emergency crossovers are anticipated to be required at regular intervals over length of dualling for both incident management and winter service operations. The A96 Dualling Inverness to Aberdeen Scheme Resilience Strategy sets out the approach to scheme resilience on the A96.
On the proposed A96 Inverness to Nairn (including Nairn Bypass) scheme an additional 5 crossover sites are proposed in addition to the 12 required by the design standard (DMRB, TA 92/03, Crossover and Changeover Design) to enhance operational resilience.