道路車輛駕駛安全之行車間距的維持，為行車安全重要因素。現實交通狀況而言，許多車輛因忽視間距，而在未保持有效煞車間隔距離下發生事故。國內外智慧型運輸系統 (Intelligent Transportation Systems, ITS)之先進安全車輛(Advanced Safety Vehicle, ASV)與先進車輛控制與安全系統（Advanced Vehicle Control and Safety Systems, AVCSS）的研究與發展，將防撞警示系統列為重點。並已有將縱向防撞系統與側向防撞系統整 Keeping a safe distance between vehicles is the main factor of safety. In actual traffic condition, a great number of accidents take place due to lack of effective brake distance. Study of Advanced Safety Vehicle (ASV) and Advanced Vehicle Control and Sa
