Speaking of INFO chunks, why not use them for storing traffic information?
The INFO chunk is a general purpose chunk that can hold a lot of diverse information. While some standard fields could hold some of the traffic information, The radio-specific data would have to be held in non-standard, private chunks anyway. Further, there could be conflicts in the use of some of the standard public chunks. By defining and standardizing a common, agreed-upon chunk specific to radio data, these problems are avoided.