Relativity has set an upper limit for all speeds , the speed of light . But the problem we can not perceive any thing going greater than the speed of light , that's our vision limit neither can we experiment with . If superstring theory predicts a universe with ten dimensions and we are only experiencing four including time . Can't the same apply for speed ? . That's we cannot go beyond our senses capability . Could'nt there be things going faster than the speed of light that we cannot see ?.