When backing out of an angled parking space on a street with two-way traffic, you should look over which shoulder?

When backing out of an angled parking space on a street with two-way traffic, looking over your right shoulder is crucial. This action provides the best visibility of oncoming traffic from the right side, which is typically where vehicles would approach as they navigate around the parked cars. By doing this, you can better assess whether the way is clear for you to exit safely.

While considering the other options, looking over both shoulders may seem like a thorough approach, but it can divide your attention and slow down your reaction time when you need to focus on immediate surroundings. Looking specifically out the rear windshield is helpful, but it doesn't give you the contextual awareness of side traffic approaching from the right, where potential conflicts are more likely. Consequently, the right shoulder provides the optimum line of sight for this specific situation.