The feature is currently available across the US, and kicks in automatically depending on your scheduling.

This comes over a year after Uber started offering guaranteed fares at the time a ride starts. In both cases, there's a clear goal: Uber wants to eliminate the uncertainty that might lead you to take a rival ride hailing service or (gasp) a taxi. If you know exactly what you'll pay, you may be more likely to take Uber again knowing that your costs will be predictable.