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Table 4 Probability of packets drop averaged over nodes in a network using CSMA.

From: On the Ability of the 802.11p MAC Method and STDMA to Support Real-Time Vehicle-to-Vehicle Communication

CSMA Sensing range
  500 meters 1000 meters
  5 Hz 10 Hz 5 Hz 10 Hz
Packet length 100 bytes 0% 0% 0% 0%
  300 bytes 0% 0% 0% 35%
  500 bytes 0% 22% 33% 53%