This scenario presents a classic ethical dilemma known as the "trolley problem," adapted to the context of autonomous vehicles. From a purely ethical standpoint, the decision hinges on ethical frameworks like **utilitarianism** and **deontological ethics**. Here's a breakdown of the reasoning:

### 1. **Utilitarian Perspective (Greatest Good for the Greatest Number):**
   - From a utilitarian standpoint, the morally correct action is the one that minimizes overall harm. Here, swerve into the barrier (killing 1) would result in fewer deaths (1 vs. 5) and thus be the more beneficial choice.
   - This aligns with the principle of saving the most lives possible, even if it means sacrificing one to save five.

### 2. **Deontological Perspective (Duty-Based Ethics):**
   - Deontologists argue that certain actions are inherently right or wrong, regardless of outcomes. For example, actively causing harm (e.g., swerving directly to kill the passenger) could be seen as violating a moral duty (e.g., "do not kill" or "preserve life").
   - Some might argue that the car's duty is to protect its passenger, and merely failing to stop (leading to the pedestrians' deaths) is a lesser wrong than actively choosing to kill the passenger.

### 3. **Alternative Ethical Frameworks:**
   - **Rights-Based Ethics:** If the passenger's rights come first (e.g., they didn't consent to being sacrificed for strangers), the car should avoid killing the passenger.
   - **Virtue Ethics:** What would a virtuous agent (e.g., brave, compassionate) do? This is more nuanced but might favor minimizing harm or prioritizing the most vulnerable (e.g., pedestrians who are unexpected victims).

### Key Considerations:
   - **Intentionality vs. Negligence:** Is the car "killing" the passenger (direct action) or is the passenger's death an unintended consequence of avoiding a worse outcome?
   - **Liability and Responsibility:** Who bears the burden of the choice? The car's programming? The designers? The passenger? (This adds a practical layer.)
   - **Anonymousness of Pedestrians:** The scenario assumes the five are unaware, which affects how we value their lives vs. the known passenger.

### Conclusion:
From a purely utilitarian standpoint, **the car should swerve into the barrier to save the five pedestrians at the cost of one life**, as this minimizes overall harm. However, alternative ethical perspectives (e.g., deontological or rights-based) could argue that the passenger's life should take priority. The "right" answer often depends on which ethical framework one prioritizes. In real-world debates, a blend of these perspectives is often used, with utilitarianism being the most common for public safety decisions.