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Speed limit indicator on Belgian highways

Am I the only one to have speed limit indicator issues on the Belgian highways?

With all the highway construction sites, some "90" signs located next to the highway on the Brussels R0, and mostly because you never find a "120" max speed sign in Belgium, my car struggles with the speed limit indicator and always warn me to slow down.

In comparison, other countries like France and Germany do put "130" speed limit signs, which makes it easier for the system to give the right speed on the screen.
I have not gone on those R0 stretches, but in the Brussels tunnels I have had times when it shows 30 km/h instead of 70. It is true that this is mostly due to construction works. And in Wallonia it seems to be worst. But I have the impression that it nicely picks up the motorway start signs (blue with road and bridge) and speed limit cancel signs (white with stripes).

I just mostly ignore what it shows anyway. And look at the indicator if I am doubting.

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