. >> there could be dozens of alternate routes changing minute by minch >> reporter: by using the app contributing -- your speed and location to help other users and traffic reports the more users we have, the more i'll be aim to do almost like my entire traffic -- report on the bay area. >> reporter: since frances dinglasan began featuring waze on the air more than 2,000 people have joined the traffic spotters group. >> someone submitted a picture with their report. >> reporter: a passenger took this picture, remember using your phone's touch screen while driving is dangerous and illegal now you can report traffic without touching your phone. >> report traffic. >> reporter: just wave your hand over your iphone and waze will ask questions to make a report. >> i would have never reported that previously. hands-free makes it easy. >> reporter: it can navigate and work. >> drive home. >> announcer: driving home. >> reporter: waze will have up to the minute status on the closure and roping of the bay bridge. in san francisco, jonathan bloom, abc7 news. >>> you can become a traffic spotter