Ridesharing services already have carpooling services that let you share a ride with strangers, but they're designed for typical commuting distances, not the city-to-city jaunts that can define commutes in places like the San Francisco Bay Area. That's where Uber hopes it can make a difference. It just launched a trial run for Pool to SF, an option that gets you from South Bay cities to San Francisco in the morning. You'll usually pay between $20 to $26, but that's potentially much cheaper than the fuel and parking costs you'd face with your own vehicle. If you have a friend tagging along, you can slap on another $10 and divvy up the fare later on.