Where are the melody roads located in Gunma prefecture?

I've heard many times that in Gunma prefecture, roads that play music when you drive over them can be found.

However, I've not been able to find a clear location for these roads. Supposedly, there is one located near Mount Haruna's lake and one near Kusatsu Onsen.

Is there an official map to find them or at least confirmed accounts?

EDIT: I actually found one by accident. Route 292 between Kusatsu and Haneo station.