The dictionary defines accident as "an unexpected and undesirable event, a mishap unforeseen and without apparent cause.There were an estimated 6,420,000 cars involved in accidents in the US in 2005. The cost of these accidents exceeds 230 Billion dollars. There were about 2.9 million injury cases and 42,636 car accident deaths. An average of 115 persons die each day in motor vehicle crashes in the United States -- one every 13 minutes. According to the World Health Organization about 3000 people die in crashes each day worldwide.Most accidents are not accidents at all: they are collisions that could and should have been avoided. Four main factors cause accidents which are Equipment Failure, Roadway Design, Poor Roadway Maintenance and the most important of all is the Driver Behavior.So we must drive very carefully considering all these factors .