The utility of an Uber Pool or Lyft Line ride is hard to deny. Those services match drivers to riders heading in the same direction. Doing so, they allow drivers to reduce total costs and translate those costs into cheaper fares. Efficiency! Sharing a ride thus means saving a good amount of money. A standard Lyft trip that might cost $14 can be as little as $3.50 in a Lyft Line. The savings quickly add up.

Such rides carry a conundrum, however. Namely, what is the etiquette of sharing a ride with another passenger?