A vehicle indicator light comprising: (a) a housing mountable on a vehicle; (b) left and right light-emitting elements (L2, L3) provided on left and right sides of the housing at a front end thereof, the left light-emitting element oriented to illuminate an area on a left forward side of the vehicle, and the right light-emitting element oriented to illuminate an area on a right forward side of the vehicle; (c) a printed circuit board comprising a microcontroller unit, a gyro-specific integrated circuit, and a driver integrated circuit; and (d) a battery for supplying electricity to the left and right light-emitting elements (L2, L3) and the printed circuit board; (e) wherein when the gyro-specific integrated circuit detects an inclination of the vehicle exceeding a predetermined angle to the left from an upright position of the vehicle, the gyro-specific integrated circuit sends a left inclination signal to the microcontroller unit which directs the driver integrated circuit to drive the left light-emitting element to glow automatically, and when the gyro-specific integrated circuit detects an inclination of the vehicle exceeding the predetermined angle to the right from the upright position, the gyro-specific integrated circuit sends a right inclination signal to the microcontroller unit which directs the driver integrated circuit to drive the right light-emitting element to glow automatically; further comprising a mounting bracket assembly having a supporting end for supporting the housing and a coupling end for coupling with the vehicle, and characterized in that the mounting bracket assembly comprises a retractable strap and a handlebar contact surface integrally formed with the retractable strap, the retractable strap being configured to wrap around a handlebar of the vehicle so that the handlebar contact surface is in direct contact with the handlebar of the vehicle and the vehicle indicator light is fixed on the handlebar. (a) a housing mountable on a vehicle; (b) left and right light-emitting elements (L2, L3) provided on left and right sides of the housing at a front end thereof, the left light-emitting element oriented to illuminate an area on a left forward side of the vehicle, and the right light-emitting element oriented to illuminate an area on a right forward side of the vehicle; (c) a printed circuit board comprising a microcontroller unit, a gyro-specific integrated circuit, and a driver integrated circuit; and (d) a battery for supplying electricity to the left and right light-emitting elements (L2, L3) and the printed circuit board; (e) wherein when the gyro-specific integrated circuit detects an inclination of the vehicle exceeding a predetermined angle to the left from an upright position of the vehicle, the gyro-specific integrated circuit sends a left inclination signal to the microcontroller unit which directs the driver integrated circuit to drive the left light-emitting element to glow automatically, and when the gyro-specific integrated circuit detects an inclination of the vehicle exceeding the predetermined angle to the right from the upright position, the gyro-specific integrated circuit sends a right inclination signal to the microcontroller unit which directs the driver integrated circuit to drive the right light-emitting element to glow automatically; further comprising a mounting bracket assembly having a supporting end for supporting the housing and a coupling end for coupling with the vehicle, and characterized in that the mounting bracket assembly comprises a retractable strap and a handlebar contact surface integrally formed with the retractable strap, the retractable strap being configured to wrap around a handlebar of the vehicle so that the handlebar contact surface is in direct contact with the handlebar of the vehicle and the vehicle indicator light is fixed on the handlebar.