I know it is a long way from Aberdeen but for those visiting Northern England; Cumbria County Council publish maps that you can download and print off of all the 'Green Lanes". They then grade them Green for 'fine to use' Amber for taken a bit of a hammering recently please use with care and red for please do not use until the condition has improved. Most are Green at the moment, There is even a report available for each road which tells you how difficult it may be.