You should not start across an intersection if you know you will block the intersection when the light turns red:

Question

Even if the signal is green, you must not enter an intersection unless you can get completely across before the light turns red. If you block the intersection, you can be cited.

Accepted Answer

Under any circumstances.

Answer

Unless you are entering the intersection on a yellow light.

Answer

Unless you are entering the intersection on a green light.

Answer

Unless you are in a hurry.