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With the increase of traffic flow on roads and the continuous requirements of smooth traffic, most intersections have taken the form of entrance lane widening, especially the left-turn lane widening. This research examined the effect of left-turn lane widening on the usability of guidance systems at the intersection in the roadway space layout. An eye-tracker was used to collect data on drivers' use of the intersection guidance system in simulated driving. The results showed that, when there are 2 left-turn lanes, the usability of the guidance system is significantly different in the case of left-turn lane widening. Overall, the usability of the guidance system with left-turn lane widening is better. In terms of overall performance, the AILC signs outperform the arrow markings in terms of effectiveness and efficiency. With the increase of the number of left-turn lanes and the total number of lanes, the conditions for the difference in the usability of the AILC signs and the arrow markings gradually changed from the left-turn lane widening to the left-turn lane without widening. Thus, the widening of the left-turn lane should be considered with caution in the future in the case of multiple left-turn lanes. The usability of the AILC sign plays a dominant role in the overall usability of the guidance system. Sign improvement should be given priority at intersections with poor usability of guidance systems.
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