International Journal of Scientific and Research Publications, Volume 4, Issue 7, July 2014 1 ISSN 2250-3153 www.ijsrp.org Design and Development of Seat Belt Alert System with Ignition Interlocking in Four Wheeler R. Karthik * , Prof. S. Karpagarajan ** , R. Gopi *** * U.G. Scholar, Department of Mechanical Engineering, Dhanalaksmi Srinivasan Engineering College, Perambalur, Tamilnadu, India. ** Professor & Researcher, Department of Mechanical Engineering, Dhanalaksmi Srinivasan Engineering College, Perambalur, Tamilnadu, India. *** Senior Trainee Officer, NTTF PVT LTD, India Abstract- This paper clearly explains about the safety and control systems in the car . Most of the accidents are occurred because of violation of rules . Result of this major accidents happened .In our day-to-day life we are careless in our safety while driving in vehicles for this we have to introduce some techniques to do these precautions compulsory . Such a new technique is explained in this paper.While driving car wearing seat belt is important that can safe our life during accident periods .But most of us are careless to wear seatbelt . When accidents that careless mistake makes loss of life of driving person and near person . more injuries for driving person and near person only than back sitting persons . I. STATISTICS FOR THE CAUSE OF ACCIDENTS (TAKEN FROM WHO ) very year the lives of almost 1.24 million people are cut short as a result of a road traffic crash. Between 20 to 50 million more people suffer non-fatal injuries, with many incurring a disability as a result of their injury. Road traffic injuries cause considerable economic losses to victims, their families, and to nations as a whole. These losses arise from the cost of treatment (including rehabilitation and incident investigation) as well as reduced/lost productivity (e.g. in wages) for those killed or disabled by their injuries, and for family members who need to take time off work (or school) to care for the injured. There are few global estimates of the costs of injury, but an estimate carried out in 2000 suggest that the economic cost of road traffic crashes was approximately US$ 518 billion. National estimates have illustrated that road traffic crashes cost countries between 1–3% of their gross national product, while the financial impact on individual families has been shown to result in increased financial borrowing and debt, and even a decline in food consumption. Road traffic injuries have been neglected from the global health agenda for many years, despite being predictable and largely preventable. Evidence from many countries shows that dramatic successes in preventing road traffic crashes can be achieved through concerted efforts that involve, but are not limited to, the health sector. E