| Summary: | Unfortunately, people die and get injured due to accidents in the traffic. Furthermore, statistics of road accidents is limited and mostly composed of serious accidents, making it difficult to draw conclusions about how to improve the safety in the traffic. Thus, there is an interest in obtaining information about critical events in the traffic, i.e. potential accident situations, since they occur much more frequently. One way of detecting critical events is to use sensors, such as accelerometers and gyroscopes. As the usage of cellphones with built-in sensors increases, it would be interesting to examine whether these sensors are good enough to detect critical events. This is where the focus of this thesis lies. An application that collects data from the cellphone’s built-in accelerometer, gyroscope and GPS was developed and tested. The data was then analysed and compared to data from accurate sensors, represented by a VBOX coupled to an IMU. The conclusions made in this thesis are that the sensors in the cellphone perform almost equivalent results compared to the VBOX. It is possible to use data from the sensors in orderto detect critical events.
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