Found it.
Presented by Sumitomo Electric Industries.
In 1970 Sumitomo Electric participated in the Japan World Exposition held in Osaka, providing its original traffic attraction in the site of the automobile pavilion. This attraction was an extraordinary exhibition in the time, in which visitors could actually take part and drive colorful mini cars. Drivers enjoyed racing around along lanes built in a grid across the circular field. The mini cars were linked with single-track guardrails. Here, our system worked to stop drivers from entering a lane which another car was coming in and indicate safe directions for drivers to select using a lever.
The rules of the game were simple; during the time limit (about two minutes), the driver reaches the other side territory will get a point. After a short pit stop to recharge, another one point will be given to the player who returns to their home territory. The driver traveling back home three times in a row will be bestowed a prize.
In this attraction, our system worked for:
(1)collision avoidance
(2)time limit control
(3)displacement of time-up cars
With the participation of 250,000 visitors in total, this attraction heralded the beginning of Sumitomo Electric’s traffic system business, widely impressing the public as a system manufacturer.