A new park and ride in the North-east hangs in the balance after transport bosses requested help from the Scottish Government to make the plans a reality.
Bosses at regional transport body Nestrans have written to Transport Minister Humza Yousaf to help pay for a new facility north of Portlethen near the Findon interchange.
The site would include a 1,000-space car park, an area for bicycles and a 50-seat waiting area.
Proposals were previously lodged in August 2011 but collapsed due to problems getting the land.
Park and rides at Bridge of Don, Ellon and Kingswells have proven to be a success.
A new £15.2 million facility at Craibstone, adjacent to the A96 trunk road, is expected to be completed by the end of next month, providing 1,000 car parking spaces.
Nestrans has revealed the proposed park and ride at Portlethen would cost £13.4m.
Chairman of the organisation Councillor Ramsay Milne has asked for the Scottish Government to “substantially” contribute to the project to make it a reality.
In his letter to the government, Cllr Milne said: “At Portlethen on the A90 approaching Aberdeen from the south, a proposed park-and-ride scheme with the capacity for 1,000 cars has been allocated in the local development plan and has received planning permission in principle.
“It is estimated that this facility would cost around £13.4m including land purchase and optimism bias.”
It adds: “My officers have been in contact with Transport Scotland officials, and ongoing dialogue has continued to ensure that proper procedures are in place in developing the proposals in line with strategic priorities and national guidance.
“I would therefore ask that you initiate further discussions and instruct your officials to consider the potential for making an appropriate contribution towards strategic park and ride in the North-east. A commitment by government to substantially fund the Portlethen scheme might seem proportionate.”
A Scottish Government spokesman said they would comment in due course.