The first-ever BMW 5 Series with a fully electric drive system has yet to make its global debut, but it has already come through the ultimate endurance test. The new BMW i5 repeatedly demonstrated both the stability of its electric powertrain and its dynamic performance qualities over the course of arduous test drives in wintry conditions. The program of testing on ice and snow lasted about a year in all, from the initial test runs to the final stages of fine-tuning. During the extensive testing on country roads, motorways and specially prepared test tracks, the development engineers mainly focused their attention on the car’s ability to drive at low temperatures and on surfaces offering little grip.