Can you turn left on a red light?

Turning left on a red light is permitted in specific circumstances, which is why the correct answer is that it is allowed only from a one-way street onto another one-way street. This rule applies because the traffic laws are designed to ensure safety while allowing some flexibility in traffic flow.

When a driver is on a one-way street, they have only left-turn traffic flow considerations to account for, which generally means other vehicles are not making left turns from that street simultaneously. The key aspect of this maneuver is that it is only permissible when it is safe to do so, and the driver must yield to all other traffic and pedestrians.

The other options do not reflect the rules governing left turns at red lights. For instance, turning left from any street onto any street does not consider the safety factors involved and is not allowed under traffic regulations. Saying that it is never allowed overlooks the specific context in which left turns on red can be made. Lastly, suggesting that it is permissible only if no vehicles are present implies a lack of understanding of yielding laws, as a driver must always yield to oncoming traffic and pedestrians, rather than assuming an absence of vehicles makes it safe.