Line matches riders going along a similar route with the same driver. The draw to share a ride with a complete stranger is a fare that's up to 60-percent cheaper than a regular Lyft ride. Now those cheaper -- and a bit more crowded -- rides will be available in more cities.

The ride-sharing company noted that on April 15, Line will be available in 15 metropolitan areas. It said it chose the new cities because they were some of its fastest growing markets. While its expanding this service, Lyft also recently announced a Carpool feature for commuters in a partnership with Bay Area Metropolitan Transportation Commission to get even more people to share rides.