The ARCADY computer program was first released in 1981. Developed by the Transport Research Laboratory, the program predicts capacities, queues and delays on roundabout approaches from user specified geometric and origin/destination data. … This model is well proven. However, of itself, it can take no account of either unused or unequally used lanes or flared sections on the entry approaches. ARCADY is in fact completely 'blind' to such occurrences, and as a consequence may produce hopelessly over-optimistic predictions. … This paper basically constitutes such a report. Examples illustrating the inability of ARCADY to directly account for non or unequal lane usage are given together with details of the authors modelling methodology aimed at achieving more 'realistic' queue and delay predictions.
CHARD, B. (1996). ARCADY Health Warning: Account for Unequal Lane Usage or Risk Damaging the Public Purse! Traffic Engineering and Control, 38(3), pp 122-132.