To ask the Scottish Government what assessment it has carried out regarding traffic options to enable safer pedestrian access on the A84 at Bridge of Teith.
Transport Scotland and our operating company BEAR Scotland have held discussions with various local stakeholders regarding the A84 Teith Bridge and options for active travel improvement between Doune and Deanston. Transport Scotland is working closely with Stirling Council in regard to this matter.
Consideration has been given to widening the existing bridge. The existing structure is Category A listed, therefore options to widen the bridge or construct a new facility immediately adjacent to it cannot be taken forward. In addition, there would be a need to realign and widen the A84 and acquire land. The limited width on the bridge deck and the inability to widen the bridge means that any improvement to the active travel infrastructure must be either a new structure further away from the existing bridge, or restrictions to vehicular space on the existing bridge.
Restrictions to vehicular space will impact the movement of vehicles across the bridge introducing queuing and delay, including to public transport services. To assess the impacts of this, a vehicular traffic modelling exercise was undertaken considering the viability and merits of potentially introducing permanent traffic signals. The detailed traffic modelling simulates the operation of vehicles in one direction at a time across Teith Bridge with traffic signals on both north and southbound approaches. This would allow the vehicular space on the bridge to be reduced to a single lane and give more space for wider footways. A pedestrian phase in the signals would allow active travel users to cross the A84 on the south side of the bridge.
Two options have been modelled. The first used traffic signals to control vehicles on the A84 in one direction at a time across the bridge. A second option incorporated the adjacent B8032 into the traffic signals. This improves access and egress to and from the local road, however increases delay for traffic on the A84. Both options included the pedestrian phase for crossing the bridge. Traffic survey data was gathered in early 2024 to inform the modelling. To simulate peak visitor times and future years, appropriate factors based on existing and historical traffic data were applied to test a range of scenarios.
The exercise was completed in January 2025, ahead of schedule. The modelling showed that the three way operation incorporating the B8032 would result in unacceptable levels of delay and queuing. A simple vehicular shuttle operation on the bridge may operate with acceptable levels of delay and queuing for vehicles including in average traffic conditions in the summer. However, the modelling indicates that in the peak hours in the summer and easter periods there may be longer delays to vehicles which may not be acceptable. As a result, further investigation is required.
Transport Scotland and BEAR have shared the results of the modelling with Stirling Council and met with them to discuss it. Stirling Council has requested that a live exercise be undertaken to directly investigate the impact on delays to vehicular traffic.
Taking account of the requirements of all modes of travel, including public transport services, it is recognised that the best form of improvement may not be amendment to the trunk road and the existing bridge, or that these may only be a temporary measure. It may be more practical and effective to create an entirely new, offline facility. The results of the traffic modelling exercise will help to inform this. Alternative options would lie outwith the trunk road and therefore outwith the responsibility of Transport Scotland. Progression of these would be the responsibility of Stirling Council or the Regional Transport Partnership to take forward, and Transport Scotland has suggested that the Council continue to appraise the best means of active travel connection between the two communities.
Discussions are underway in Transport Scotland to establish the potential for bringing forward the live exercise, however this will be subject to available budgets and the prioritisation of active travel schemes across the country. Should it be possible to undertake the trial, following this, further discussions will be held with stakeholders, including Stirling Council, and a decision on any further steps balancing the needs of the users of all modes of travel will be made.