Disclosed is a system for providing vehicle indicator lights, such as brake lights for a bicycle or motorcycle. The system may include at least one indicator light, a gyroscopic sensor, an accelerometer, a power supply, and a signal processing unit that receives inputs from the gyroscopic sensor and the accelerometer and activates an indicator light based on inputs from the sensors. Various algorithmic functions and other features may also be included in the system to make detection more robust and the make the system useable for a variety of different vehicle applications.