Track seating is commonly referred to as grandstands or high capacity aluminium bleachers, which are usually set up along a racetrack, where either auto racing or horse racing would be held. most of them are permanent structure for tens of years usage. However, in some special cases, e.g. F1 held in Singapore, with auto racing across city, we came up with temporary grandstands to resolve the rub. The likes of metal structures are designed and fabricated in factory, and assembled on the spot pretty easily.