This paper proposes three access methods vehicle-to-vehicle (V2V) communication, infrastructure-to-vehicle (I2V) and pedestrian-to-vehicle (P2V) communications which are suitable for this system. They are evaluated by static simulation in which a roadside Unit (RSU), many on-board units (OBEs) and many pedestrian portable terminals (PPTs) are distributed throughout a large intersection. Moreover these methods are tested using radio equipment in real field.