Forgetting to cancel turn signals is dangerous, leading other drivers to think you’re turning, when in fact you’re not. Conceived and designed by motorcyclists, the Smart Turn System protects motorcyclists by sensing when they’ve completed a turn and automatically cancelling turn signals. Less than 2 inches long and only 1.25 inches thick, the STS processes 300 different data elements on acceleration, vibration, inclination and changes in direction to decide when to cancel turn signals. Can be installed on many vintage machines. $162, includes shipping.