Sidecar has raised $15 million to expand its ride-sharing service

Sidecar may go down as the little engine that could. The ride-sharing startup announced Monday that it has raised another $15 million, bringing its total funding to date to more than $30 million. The latest round of funding was led by Avalon Ventures and included investments from Union Square Ventures and Virgin founder Richard Branson. That’s a significant amount for most startups, though it’s less impressive when compared to other competitors in the space like Lyft, which has raised about 10 times as much, and Uber, which has secured backing of well over $1 billion.