Abstract
The development of freeway construction and the increasing coverage of the road network have led to increasing requirements for guide signs. This article investigated drivers’ visual cognition pattern regarding exit guide signs on freeway interchanges. A static visual cognition experiment with 32 participants was carried out. The route information volume (four levels) and destination information volume (seven levels) were selected as the variables. An eye-tracking system was utilized to record drivers’ eye movement indicators, such as eye movement time, saccade frequency, seek time, and fixation duration. The results indicated that the eye movement time, saccade frequency, and seek time are highly correlated with information volume and increase significantly with the increases in information volume; although the fixation duration has no correlation with information volume, the fixation duration value, saccade frequency, and seek time of destination information are significantly higher than those of route information, and the destination information fulfills a stronger guiding function during the driver’s trip. The corresponding threshold values of destination information are 5, 5, 4, and 3 under the four levels of route information, and the threshold value of route information is 3.
Highlights
Guide signs can convey necessary information regarding travel and route to drivers, enabling drivers to arrive at their destinations quickly and safely.[1]
The Eye movement time (EMT), saccade frequency, seek time, and fixation duration were selected as the indicators in this study, and the route and destination parts were selected as the analysis parts
To solve problems existing in engineering applications, such as the information overload of freeway guide signs, a static visual cognition experiment was performed using an eye-tracking system that acquired participants’ eye movement parameters
Summary
Guide signs can convey necessary information regarding travel and route to drivers, enabling drivers to arrive at their destinations quickly and safely.[1] According to national freeway crash statistics, approximately 10% of traffic crashes are related to road network construction, and more than 40% of these crashes occur in the exit area of the freeway.[2] The exit guide sign, as an important part of freeway infrastructure, plays a role in traffic guidance and traffic control and directly affects traffic safety. As a pivotal connection between the driver and the road network, the content of guide signs can influence the driver’s cognition. With the rapid development of road network construction of the freeway system in China, many problems have been raised in the process of applying exit guide signs on freeway interchanges. The increasing density of the road network, ineffective traffic management systems, and the concept of ‘‘more information is better than none’’ all contribute to information overload.
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