What's the best LED matrice for the traffic

Good day everybody and happy new year.

I found that interesting article: https://www.velleman.eu/downloads/0/user/usermanual_hvm207_fr.pdf related to that item: https://www.velleman.eu/products/view/?id=428338

I really like it because it work with Arduino.

I wonder, if we can display letters or numbers. My idea is to acquired some of them, may be four or hight, join them together in order to have a large panel to display the speed limitation.

My project would be to display the speed of a car/moto/track with a smily :slight_smile: or not :frowning: .

For now, I have not selected a LiDAR, but I would like to choose the good Matrix of LEDs.

Is that VM207 is nice for a such project ?
Or would recommand me another panel of leds?
I would like to build it with Arduino or may be with a Raspberry, but Arduino would be my big preferences :smile:

Many thanks for your suggestion