thank you for your help and reply. sorry i made wrong. our project is not measuring the speed. We use accelerometer to get acceleration and aside from that it detect tilts. Our project will aid the driver. The hardware will send signal to the driver and the signal will be LED DISPLAY. The driver will choose either he will follow the signal or not. Also our project will focus on fuel efficiency.
Example:
If the driver go left. Our hardware will act and create signal via LED.