An accident is an unexpected and unintended event. The avoidance of Traffic Rule and carelessness of driver are the major factors for occurrence of Vehicle accidents which cause harm to human being as well the environment. Nowadays most of the countries are making it mandatory to wear helmet and avoid drunken driving. But still the rules are being violated. In order to overcome this problem, A GSM Based Smart-Helmet can be introduced as an intelligent system, which checks whether the person is wearing the helmet and has a nonalcoholic breath before driving. If any of these conditions are not met, the bike does not start and a message is sent to the concerned person. A transmitter on Smart-Helmet generates a signal on the basis of two mentioned conditions with the help of a switch and an alcohol sensor and then sends it to the receiver on the bike through the RF transmitter. Now, the receiver decodes the signal and the microcontroller, according to decoded signal, takes the required action. In case alcohol is detected the GSM module attached to the receiving unit sends message to a registered mobile number. Keywords— Helmet; Drunken Driving;Rules violated; GSM;