Final answer:
The driver should look left, right, and center when checking for an opening in traffic at an intersection to ensure all directions are clear before crossing.
Step-by-step explanation:
When checking for an opening in traffic before crossing an intersection, the driver should look in three different places for oncoming vehicles and potential hazards. These are: left, right, and center. First, one should look to the left to ensure no vehicles are approaching from that direction. Next, checking to the right is important as it is the nearest lane of traffic after the left. Lastly, looking at the center allows the driver to be aware of oncoming traffic from the opposite direction. These checks should be done in a way that accounts for any blind spots and ensures the driver has a full view of the intersection.