I think your Nuvi 660 has Bluetooth.
From this link:Talk about worry-free driving. nüvi 660 integrates Bluetooth® wireless technology with a built-in microphone and speaker, so you can pair it with your compatible Bluetooth phone and talk hands-free through the 660 while staying focused on the road. Simply dial numbers with nüvi's touch screen keypad to make a call.
Spoiler: info on the 660
If that is the case then you can link up with Garmin Drive app on your smartphone to get traffic
The Garmin Drive™ app is a simple and convenient app solution for the latest Garmin automotive navigators and dash cams. Visit garmin.com/driveapp for a list of compatible devices.
For compatible navigators, the Garmin Drive app provides real-time information for traffic, parking, advanced weather, and photoLive traffic cameras, in addition to the ability to send and receive calls, texts, and notifications from your Bluetooth-enabled mobile device.Spoiler: Graim Drive app
Looking at various forums it appears that TrafficMaster has stopped broadcasting them via Classic FM
Plus:
There are other traffic app for smartphones.
Inrix TMC I think is for the US.
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