A driver didn't have a license and went down a one-way street, moving in the wrong direction. A policeman saw it but did nothing to stop the driver. Why?

Who knows?

he was walking

There could be a few possible explanations as to why the policeman did nothing to stop the driver in this situation:

1. Lack of awareness: It's possible that the policeman didn't notice the driver going down the one-way street in the wrong direction because they were not paying attention or were focused on something else.

2. Prioritizing: The policeman might have been dealing with a more urgent or serious situation at that moment, requiring their immediate attention. In such cases, they may choose to let less severe traffic violations slide to focus on more pressing matters.

3. Limited jurisdiction: Depending on the circumstances, the police officer's jurisdiction may not extend to traffic violations or enforcement in that specific area. They may not have the authority to stop or cite the driver in that particular location.

4. Gathering evidence: It is possible that the policeman observed the driver's illegal actions and decided not to intervene immediately. Instead, they may have chosen to gather evidence, such as recording the license plate or documenting the incident, to better pursue legal action later.

5. Lack of resources: In some cases, the police department may be understaffed, and officers might have to prioritize their efforts accordingly. If there weren't enough officers available to handle the situation, the policeman may have been unable to respond promptly.

Please note that these explanations are hypothetical, and the actual reason behind the policeman's inaction can vary based on specific circumstances.