—Vehicle-to-vehicle and vehicle-to-infrastructure wireless systems are currently under development to improve the traffic safety and efficiency while providing Internet connectivity on the move. A widespread adoption of these wireless vehicular communication technologies will require an efficient use of the radio channel resources. To this end, this work proposes and analyses an opportunistic-driven adaptive radio resource management scheme that achieves the target traffic safety performance and efficiently uses the transmission and channel resources. Keywords-component—Adaptive radio resource management, vehicular communications, traffic safety.