A Vehicular Ad-Hoc Network (VANET) is a network where vehicles can disseminate

information such as traffic conditions, availability of free parking lots or content.

In order to fulfill VANET application requirements (Time To Live (TTL), information

distance spread), we need to use the available network resources (e.g., radio

capacity) optimally depending on the traffic conditions. While cellular-based approaches

(e.g., 3rd Generation mobile telecommunications (3G)) is suited for low

traffic conditions, dense traffic (where users might already use 3G) is particularly

suited for relying on Vehicle-to-Vehicle (V2V) communication (e.g., ad-hoc WIFI).

There is a clear need to adapt the dissemination strategy to the current traffic conditions

and application requirements. The optimal solution is based on combining

or alternating between cellular-based and opportunistic dissemination strategies.