What is the right course of action?

You chose correctly with options 1 and 2. Here’s why:

The yellow diamond sign means you are on a priority road. This means you have the right of way over vehicles coming from side roads.

1. You must let the blue vehicle pass first because it is coming from your right and is on the priority road, so you have to wait for it.

2. You may turn before the green vehicle because the sign shows that vehicles coming from the right at the intersection where the green vehicle is do not have priority. Your priority road continues through your turn, so you can turn ahead of the green vehicle.

Option 3 is wrong because the green vehicle is not on the priority road and must yield to you.

Understanding priority roads and the priority-from-the-right rule are key in such situations. Here, the priority road gives you priority over the green vehicle but you must yield to the blue vehicle coming from the right.