In an effort to combat drowsy driving, Uber announced on Feb. 12 new national rules that restrict drivers to 12-hour shifts with mandatory 6-hour breaks in between. Uber will enforce the rule through a new drive-time function in its driver app, which will first warn drivers and then temporarily cut off their access to the app, which is their only conduit to receive ride requests. The Uber announcement drove a lot of media coverage, almost all of it positive, but it also left open opportunities to do more to improve safety.