The latency is likely lower since you don't need to look for parking. Slightly off-topic: The current Tokyo subway system has the unfortunate property that it

The latency is likely lower since you don't need to look for parking. Slightly off-topic: The current Tokyo subway system has the unfortunate property that it turns off between midnight (~0) and early morning (~5). The Loop thing wouldn't have this likely, but I don't understand why Tokyo does this, especially for the trains that don't have a driver.