Israeli students were assigned by college to hack Google-owned Waze GPS app, an Israeli-made Smartphone app that provides directions and alerts drivers to traffic and accidents. Fourth-year students at Technion-Israel Institute of Technology, with the help of two advisers created a virtual program that successfully caused the popular navigation application Waze to report fake traffic jams. Waze navigation app for Smartphones is widely used in Israel and was so popular that last summer Google bought it for $1 billion.
Source: https://thehackernews.com/2014/04/popular-navigation-app-hijacked-with.html