An occupant protection system of the type of predicted rear-end collision adaptive control raises an alarm when a rear-end collision is predicted and activates a belt tensioning motor to strain a safety belt so as to restrain the occupant strongly against the back of a seat at a point of time specified seconds before a possible occurrence of the predicted rear-end collision. In specific running situations such as cornering a sharp bent lane and making a right or left turn where the occupant protection system possibly confuses a stationary traffic device with a following vehicle, the occupant protection system is prevented from raising an alarm of a possible rear-end collision and straining the safety belt.
