This paper some methods are discussed how to prevent the accident. Now day lot many accident occurs due to the miss behavior of driver. So avoid this type of problem these system is useful. This system gives warring before the increasing speed of vehicle, change the lane, obstacle is present. With the help of sensor check the some parameter harmful and create accident. This system is also useful for identify accident location by using GPS system and call to police station or hospital by using GSM system. This process is helpful for emergency purpose.