Wireless technologies now allow efficient vehicle-to-vehicle ad hoc communications. We present a cooperative application that allows the vehicles exchanging the Local Dynamic Map (LDM) built based on their own perception of their environment, obtained through various sensors, in order to achieve an enhanced collective perception in the road traffic. Through simulation based evaluation, we show that reasonable performance can be achieved through vehicle-to-vehicle communications for such applications in realistic road traffic scenarios. The results show how to fix the frequency of the exchanges in the collective perception application in order to achieve both predefined packet delivery ratio and end-to-end delay.