High Quality Content by WIKIPEDIA articles! Intelligent Speed Adaptation (ISA), also known as Intelligent Speed Assistance and Speed Alerting, is any system that constantly monitors vehicle speed and the local speed limit on a road and implements an action when the vehicle is detected to be exceeding the speed limit. This can be done through an advisory system, where the driver is warned, or through an intervention system where the driving systems of the vehicle are controlled automatically to reduce the vehicle’s speed.