Lyft is giving riders a way to make a multi-stop trip, letting them use the Lyft app to add an extra destination for two-stop trips. The logic is simple: With more users, especially city-dwellers, tapping ride-sharing and on-demand services in place of owning a vehicle, it’s more likely they’ll want some flexibility in how those trips are routed, since a multi-errand excursion is a pretty common occurrence for most. Adding a side-trip is easy enough: You put your first stop in as the destination when requesting your ride, and then tap a new “+” icon next to the destination to add a final drop-off location…It’s a small but smart addition, and one that could also easily translate into a core component of a more automated ride-sharing interaction model in the future.