This paper presents results from measurements on Vehicle to Vehicle (V2V) communication between participants in a cooperative application: vehicle platooning. The platoon being studied consists of four vehicles; one truck in the lead and three passenger cars following. The V2V-communication node in each vehicle contains an 802.11p radio tuned to 5.9 GHz. It is used to send messages between vehicles to coordinate movements and maintain safety in the platoon. In cooperative applications, V2V-communication is an enabling technology. The V2V-communication quality is studied according to packet error rate. This is measured in tests with different speeds, antenna position and on two tracks. The paper draws general conclusions on the performance of V2Vcommunication and presents a comparison of the tested antenna placements on the truck.