With this technique, vehicles estimate the road
traffic density from the received broadcast beacons or CAMs,
and periodically transmit this information to other vehicles. As
a result, vehicles obtain traffic density information for different
locations, and can detect congestion situations by comparing
these road traffic density estimates with average traffic density
values for the road segments under evaluation. The capacity of
the COC technique to detect traffic congestion through V2V
communications is obtained at the expense of an additional
communications load that could saturate the cooperative
wireless channel. To limit the communications load generated
by V2V protocols that detect road traffic conditions,
TrafficView [2] employs an aggregation method that combines
data from different vehicles located close to each other.