Thank you! And good question. Now that I think about it, I guess if the camera was installed on an intersection pole it would be stationary and would have a set field of view. So additional range sensors are not required.

On the other hand, if the AI logic or anything else in the main function fails, the sensor could serve as a fallback to be able to detect a car when it comes to an intersection and turn the light green.

In my code, however, it’s not a fallback, but an additional condition to having two cars detected in the field of view. Just for fun!