Lyft just came out with its biggest innovation yet: buses

Lyft is truly an innovator of transportation.

The ride-hailing app is testing a new service in San Francisco and Chicago called Shuttle. Like the name suggests, Shuttle is basically a bus.

Lyft users in those two cities can request a Lyft Line like they normally would, and then see the option to switch to a Shuttle if they are near one of the preset Shuttle routes. Those routes have preset pickup and dropoff points, like, again, a bus.

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Shuttle will only be available during weekday commuter hours, from 6:30 to 10 a.m. and 4 to 8 p.m. Mondays through Fridays.

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The cost of a Shuttle ride is fixed — sort of. It won't have surge pricing applied, but like a regular taxi the price can change depending on time and distance. So an actual bus is definitely more reliable price-wise.

Shuttle service will operate within Lyft Line, Lyft's ride-pooling service. Lyft won't yet say when the service will roll out to other cities and customers.

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The startup Chariot tried something similar in San Francisco and Austin. And Uber is experimenting with a commute option in D.C.'s suburbs.

"Lyft Line is the future of rideshare, and we often test new features that we believe will have positive impact on our passengers' transportation options," Lyft said through a spokesperson. "We look forward to feedback on Shuttle from the Lyft community; we see a number of commuting use cases that this mode will make easier."