You might not think that the trusty old Volvo would be at the cutting edge of technological innovation, but its new ground-breaking brake system has left rivals trailing in its wake. The pioneering, if not-very-catchily-named, City Safety Autonomous Emergency Braking (AEB) system, is now fitted as standard on all Volvo models and is even helping to drive down insurance costs. Every make and model of car falls into one of 50 different insurance groups – the higher the number group, the more expensive your car insurance premiums will be, so the lower the group the better. Volvo’s braking system effectively makes its cars safer, and so has led to the insurance ratings of all new Volvo cars falling by up to four groups. According to Volvo, savings as a result of this can be as much as around £150 a year, although of course the actual saving you make will depend on your age, driving experience and claims history. So far, over a million Volvos fitted with the new technology have been sold, and anyone buying a new model will benefit. But how does the City Safety braking system actually work?