Observations made at 4 am are more important

Normal drivers need light and unobstructed views of the road. 4 am cab drivers need neither. 4 am cab drivers are ninja Jedi, killing time before the billable day starts and they start killing for real.

When you're in a cab and the cabbie can't see out his front window because it's fogged over and it may not matter because his headlights may not be on, don't fret. Check the time. Is it 4 am? Yes? Then it's all good. Ninja Jedi cabbie is going to take care of you.

Not 4 am? There may be a problem. Your driver may not be a ninja Jedi. Bigger problem: your driver may be a ninja Jedi and he's on the clock. Ninja Jedi is going to take care of you.