What exactly does Telraam measure? What is not measured ?

What Telraam counts and what it does not count

What Telraam counts:

Telraam counts pedestrians, cyclists, cars and freight/heavy vehicles. The Telraam device is a combination of a Raspberry Pi microcomputer, sensors and a low-resolution camera. The device is mounted on the inside of an upper-floor window with a view over the street. To send the traffic count data straight to the central database, the device needs a continuous Wi-Fi connection to the internet.  The images analysed by Telraam are pixelised., like on the picture below:

The analysis simply uses the size and speed of the passing object, which induces a slight margin of error. For example, because of its size the Telraam will count a tram as a truck. Vans can either be counted as trucks or cars, depending on their size. Buses are also counted as trucks, because of their size.

Telraam is under constant development, so it is possible that some of the data presented is not (yet) completely accurate. We are working on automatic solutions to filter out bad data, but it is not yet in production. Anyway, the more data we collect, the better Telraam will eventually be able to make the distinction.

What Telraam doesn't count:

• Telraam does not count when it is dark. 
• Telraam does not recognise individual vehicles (number plates).
• Telraam does not recognise faces. 
• Telraam does not count an EXACT number of vehicles over a very short period
• Telraam is not a speed camera.

Some strange data may appear

The data seem strange to you? Just read this article to get some explanation: "The data in my Telraam seem to have some inconsistenties".