How to validate your own Telraamdata

You want to validate the data your Telraamdata. Step by step, this article will guide you to perform a manual validation of the accuracy of the counted number of road users. To perform a validation of the speed, you need equipment like e.g. a laser gun, so we leave that aside in this article.

Step 1 - Preparation

1️⃣    Before starting the data validation process, it is important to understand several definitions and concepts, such as 'precision' and 'accuracy' of a Telraam, how the validation is done correctly, what can be causes of inaccuracies, ...

👀 Therefore, first read the following article,  👀 
"PRECISION, ACCURACY, AND VALIDATIONS OF THE ORIGINAL TELRAAM SENSOR"

2️⃣    Choose the day and time to perform the manual count. Note that this should not be during twilight hours.

3️⃣    Print the validation manual count sheet that you can use to conduct manual counts (see attachment at the bottom)

Step 2 - Perform the manual count

4️⃣    Perform the manual count

Step 3 - Check if the data quality of your Telraam was good

5️⃣    Go to your dashboard

6️⃣    Go to 'detailed overview'

7️⃣    Look for the day and time for which you performed the manual count

8️⃣    Check of the data of this moment are 'good quality' or 'poor quality'

 👍🏼    If 'good quality' --> that means your Telraam had a good uptime. You can move on to step 4, the comparison.

 👎🏼    If 'poor' quality' --> that means your Telraam did not have enough uptime. So the data from this hour is not qualitative to make a comparison with your manual count. You will have to start over.

The timestamp in this overview, is the start hour. So 16:00h is the period going from 16:00h until 17:00h.

Stap 4 - Make the comparison

9️⃣    The first figure you need to compare is "total road users"

Inaccuracies (when the manual count data does not match the Telraam data) can be caused by:

➙   The Telraam sensor cannot see the whole road surface

➙   Obstructed and merged objects

➙    Traffic jams with standing still traffic, or long cycle times at traffic lights

➙   The sunshade is not installed (and the Telraam sensor is in a Sun-lit window)

👀 Read more in the previously mentioned article about these causes: "PRECISION, ACCURACY, AND VALIDATIONS OF THE ORIGINAL TELRAAM SENSOR"

 🔟    Secondly, you can compare the numbers by modality.

Inaccuracies (when the manual count data does not match the Telraam data) can be caused by:

➙   Very low or high camera view angle.

➙   Long, strong shadows

➙    Obstruction, or tight grouping of road users

➙   Atypical vehicle composition

👀 Read more in the previously mentioned article about these causes: "PRECISION, ACCURACY, AND VALIDATIONS OF THE ORIGINAL TELRAAM SENSOR"

 📩  Want to share your results? Feel free to email them to
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