Stuttgart, Feb 10, 2014 - The new GLA-Class has successfully completed an endurance trial which, in addition to on-road testing, also takes in the stresses and strains typical of off-road all-wheel drive use. In the course of this track & field endurance trial extending over some nine months, a vehicle's entire subsequent lifespan in the customer's hands is simulated at time-lapse speed to verify the GLA's fitness for series production.