Dick Smith:
The USA and Canada have many thousands of UNICOMs, which have been operating for decades without any problems - common sense prevails. They will give traffic information in any way they want to as it is up to the pilot to decide the information to accept. The non-prescriptive US system is a superb improver in safety....etc
You will note from MrApproach's post the following reference from the AIM
Information Provided by Aeronautical Advisory Stations (UNICOM).....2. On pilot request, UNICOM stations may provide pilots with weather information, wind direction, the recommended runway, or other necessary information.
it would appear that traffic information IS NOT recognised by the FAA as being a prime UNICOM function.
Bolding is for emphasis only.