Countdown timers (CDTs) for pedestrians and cars have been shown to produce various effects, including improved efficiency and decreased safety. This study aimed to explore adaptive behaviours of cyclists towards a CDT to green traffic light, conducted as a before-after study in real traffic. Cyclists adapted to the CDT by searching for and using the information that it provided, mainly in terms of speed adaptation and glance behaviour. Start-up delays were reduced but there is a concern that red light violations could increase. There might be undesirable effects on crucial information intake in cases where the CDT was used not as a complement but as a substitute for the traffic light. The results essentially indicate that cyclists use the information provided by the CDT for their own efficiency, rather than for rule-based safety.

行人和汽车的倒数计时器 (CDT) 已被证明会产生各种影响，包括提高效率和降低安全性。本研究旨在探索骑自行车的人对 CDT 对绿色交通灯的适应性行为，作为在实际交通中进行的前后研究。骑自行车的人通过搜索和使用 CDT 提供的信息来适应 CDT，主要是在速度适应和扫视行为方面。启动延迟有所减少，但有人担心闯红灯的情况可能会增加。如果 CDT 不是用作补充而是用作交通灯的替代品，则可能会对关键信息的摄入产生不良影响。结果基本上表明，骑自行车的人使用 CDT 提供的信息是为了提高自己的效率，而不是为了基于规则的安全。