Garmin Live Traffic

Purchasing a GPS unit simply because it has traffic alerts is not a contributing factor for me when shopping for a GPS because there are too many holes in the system. I have found that the traffic alerts available on most GPS units are limited to only SOME larger cities. For example; from the Tampa and Orlando, Florida areas to Cincinnati, Ohio, the only traffic info available on the GPS is in Atlanta. There is info available for Nashville, (I-24, I-40, & I-65) but nothing for Chattanooga or Knoxville, both of which are subject to major delays on I-24 and I-75. Many units will tell you there is a delay ahead, but will not show you exactly where it is or what direction is effected. If there is a major incident on a rural interstate, which may shut it down for hours, your will never know about it until your already stuck.