Final answer:
It is safe to enter an intersection on a solid green light when you have enough space to cross it before the light turns red.
Step-by-step explanation:
When it is safe to enter an intersection on a solid green light depends on the specific traffic situation. Generally, it is safe to enter an intersection on a solid green light when you have enough space to cross the intersection before the light turns red. This means that you should not enter the intersection if you cannot completely cross it before the light changes.
For example, if you are approaching an intersection and there is a line of cars already in the intersection waiting to turn left, it would not be safe to enter the intersection because you may end up blocking the intersection or causing a collision. It is safe to enter an intersection on a solid green light when you have enough space to cross it before the light turns red.