We Propose A Prototype Pedestrian-to-vehicle Communication System Which Uses A Cellular Phone And Wireless Communication To Improve The Safety Of Pedestrians. One Of The Effectual Measures Against Pedestrian-to-vehicle Accidents Is To Make Each Of Pedestrians And Drivers Find The Others And Recognize The Risk From Out Of Sight And With Time To Spare For Avoidance Of Accidents. A Pedestrian-to-vehicle Communication System Was Developed By Using A Cellular Phone And A Car Navigation System Equipped With GPS And Wireless Communication Function. We Focused On Intersections As A Traffic Scene To Be Covered By The System. After Data Was Exchanged Via FOMA In A Wide Area, Information Could Be Exchanged Between A Pedestrian And A Vehicle Via WLAN 20m, 100m Away From An Intersection To Different Directions In About 20ms. And, The System Could Give An Alarm To Pedestrians And Cars With Collision Risk.