All the Jambuster apps can access the TfL video cameras spread around London.
This means you can see what the actual traffic is like on the ground, rather than just reading about it. If a picture is worth a thousand words, a video is worth a million.
You can see the videos by simply clicking on the blue camera icon from either the main screen or the summary screen. Thats all you need to do.
There are hundreds of video cameras spread across London, though most of them are around the centre of London and around well known hot spots such as the Blackwall Tunnel. Use the video cameras to check not just the traffic at a location but also the approach roads that lead up to the problem and so avoid the problem all together.
Simple, easy and efective.