Wouldn't it be nice if, say when you're driving to a place like Big Bear, you could know about road closures - because for example, there's a massive manhunt - before you get stuck on Highway 18 for hours on end? Well, as of today, you can - if you use the popular navigation app, Waze.

With nearly 40 million users worldwide, the Israeli startup has won drivers' affections with their traffic reports and accurate alternative routes.

Devindra Hardawar - National Editor at Venture Beat - helps us understand the app.