BMW i3 and i8 concept cars race into Olympic Park - photo 1BMW i3 and i8 concept cars race into Olympic Park - photo 2BMW i3 and i8 concept cars race into Olympic Park - photo 3BMW i3 and i8 concept cars race into Olympic Park - photo 4BMW i3 and i8 concept cars race into Olympic Park - photo 5BMW i3 and i8 concept cars race into Olympic Park - photo 6BMW i3 and i8 concept cars race into Olympic Park - photo 7BMW i3 and i8 concept cars race into Olympic Park - photo 8