In this paper, a cellular automaton model is proposed to describe the traffic flow at the grade roundabout crossing with the inner roundabout lane and the outer roundabout lane.

从道路结构出发，对具有内、外环道的平面环形交叉路口建立了具有多个道路瓶颈的元胞自动机模型，对平面环行交叉路口的交通流进行研究。

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Kramer, who won the 5, 000m title, was quickest by more than four seconds, but was thrown out after he skated on the inner lane instead of the outer lane.

BBC: Sven Kramer mistake hands 10,000m gold to Korea's Lee