Yes, it is a workaround for the missing control behavior of the radar.
There is no property to activate/deactivate circuit logic as with other entities. For whatever reason Wube left that out when it added control behavior in 2.0
as soon as a cable is connected, the cirquit logic is active:
- red wire means "stop" you can enabale it with a green signal,
- green wire means "run" and you can disable it with a red signal.
- if there both cables connected (and no red/green signal) => "stop",