The taxi is direction purchased — someone else drives, you name the destination, the meter runs. Hailing one that will not stop is help visible but unavailable; the running meter is assistance's accumulating cost; the driver who knows a better way, guidance trusted or doubted.
Positive Resonance
Destination named and served, the hired guide, doors to anywhere
Shadow Aspect
The meter always running, taxis passing full, delivered somewhere wrong
Nuances
Taxi won't stop: available help passing you by
The meter running: the cost of being carried
Wrong destination: guidance delivering you elsewhere