Traffic Cam apps are pretty popular. Traffic Cam Viewer (free for a limited time) is basic but does the job, and it works for traffic cameras just about anywhere in the world. Most of the traffic apps are specific to a region or particular road, while Traffic Cam Viewer can be set to view cameras almost anywhere.
To get things started, you take a trip to the setup menu and scroll to an area you are interested in. It could be a state in the US or another country altogether. Another scroll wheel then appears, from which you can select specific traffic camera locations. In preferences, you can adjust the display for the number of viewable columns.