Between 2000 and 1500 m before exit 15 on A51 in the direction Marseille 5 people in one car saw 3 x 3 lights crossing the highway from the left to the right. After some seconds the ligths fadened, became stronger again and disappeared then completly. The height of the object was 150 to 300 m from ground. The object look like a a stadium flood light, but was moving and to high to be a lighting system.