Burger King Flora Centre

On the evening of the 27th May I vivited Burger King next to Flora center at about 1900 hrs. The store appeared to be busier than normal, with the parking area very congested. The car in front of me at the drive through made a loud s****ing niose. It turned out that the drive through had been blocked with black plastic trays about 100mm high. As it was dark and the tray was black on a black tar surface with little lighting, the car in front drove over the tray. It looked like the undercarriage of his car was damaged. I reversed out and drove away. If it wasn't for te car in front of me, I would also have driven over this tray. Surely there was another way of closing the drive through that would have made it obvious that there was a problem. This was an unacceptable state of affairs