When would the following vehicles be able to continue driving?

1. Correct answer: Only when the barrier is completely opened and a green light is shown by the traffic light.
2. You should only refer to the barrier and not to the traffic light.
3. When the light in the traffic light changes to a steady yellow.
4. Immediately as the barrier starts to open and a flickering red light is shown by the traffic light.

WhyYou may go only when the barrier is fully raised and the light is green.