Similar findings were observed in a prospective study when drivers with insulin-treated diabetes reported that they felt safe to drive on around 25 % of occasions when they had already ascertained that their capillary blood glucose was low (below 2.2 mmol/l (40 mg/dl)), suggesting that errors of judgment can arise from misperceptions about the safety of driving with a low blood glucose [58]. This evidence concerns the gene INS and diabetes mellitus.