The rules are simple: If you’re in an area where there are motorcyclists, use a hand-held intercom.
And it’s best if you use a device that can send a text message to a phone nearby so it can be read.
For example, a hand held mobile device, such as a smartphone, works well for text messages.
But you should also have a hand or earpiece, such a headset, in your car, or on your bike to listen to an intercom call while driving.
If you are behind the wheel of a motorbike, it may be more convenient to use a motorcycle horn.
You can also have an audible intercom beep.
This will alert the driver that the operator wants to speak with you.
This should be done slowly so as not to disturb other drivers.
You’ll want to be careful that you can hear the message even if it’s not loud.
And you can listen to the intercom while driving by looking at the driver or looking at a sign indicating that the call is coming from your car.
Don’t make the mistake of turning on the interphone while the driver is in the back seat, as that can make you sound like you’re on a call, too.