text: Not only do phones reduce traffic by providing people with the most effective way of reaching their location, but they also give updates that wouldn't necessarily be given otherwise. GPS does this by providing people with traffic options and traffic updates, which works by calculating how many users are on each road. This information is useful because the wider-spread the technology is, the more information can be collected to provide more accurate data to represent traffic effectively. This indirectly reduces traffic by providing alternative routes of travel.