The fallen radar was first spotted around 6.30 am on Saturday, with several photos also circulating on social media.
Police are now looking for witnesses after the fixed radar was found on the ground along the N7 near Lipperscheid.
The authorities say that investigations are underway to determine how the device could have ended up in this position.
Possible witnesses of the scene can contact the police of Diekirch-Vianden by phone (+352) 244801000 or by e-mail at the following address: firstname.lastname@example.org.
© RTL mobile reporter