Fifteen former Google engineers, including long-time self-driving pioneer Anthony Levandowski, have left the company to create Otto, a start-up based on bringing partial autonomous driving to big-rig trucks.

As the NYT notes, the start-up has great creds: Levandowski designed a self-driving motorcycle while still a grad student, and his first start-up was acquired by Google. Co-founder Lior Ron was previously lead engineer on Google Maps.

Otto’s plan differs from Google’s self-driving car project in two ways …

First, The Verge reports that Otto aims to retrofit the kit to existing vehicles, rather than manufacture new ones. Second, the system only facilitates autonomous driving on highways.

Read more here.