Whether youâ€™re road-tripping locally or internationally, consider Waze (Free). This mobile app for crowd-sourced traffic information is the equivalent of several thousand good buddies looking out for you on the road. Think of it as Twitter for drivers. â€œWazersâ€ will alert you to speed traps, accidents, and road conditions that might adversely affect your travel. You can access Waze on your iPhone, Android, Windows Mobile, Symbian, and other smart devices.