Method for retracting a seat belt

The present disclosure relates to a method for retracting a seat belt (9) of a vehicle (3), the method comprising the steps of - determining an excessive length (L ” ) of seat belt pulled out, the excessive length (L ” ) of seat belt pulled out being the difference between the current length (L) and the minimum length (L min ) of seat belt pulled out, when the seat belt (9) is in use, - in case of detecting a collision or and/or a risk situation involving the vehicle (3), retracting the seat belt (9) by applying a retraction force (F), the retraction force (F) being a function of the excessive length (L ” ) of seat belt pulled out. The disclosure further relates to a safety arrangement (1) of a vehicle (3) comprising a seat belt (9), a first sensor (11) for determining an excessive length (L ” ) of seat belt pulled out, a collision detection system (13), a retractor (15) for retracting said seat belt (9) by applying the retraction force (F), and a processor (17)), which is adapted for determining the retraction force (F) as a function of said excessive length (L ” ) of seat belt pulled out.