While was in a traffic jam in koohsangi street in mashhad, iran, i was looking at sky randomly and then i saw a shinny and bright object croosing a straight path in the sky with a very high speed, hieght certainly much less than an airplane's. the first thought was either an airplane or a shooting star. then i realized it was way faster than a normal plane and i didn't hear any sound referring a plane and it didn't have any tail to be a shooting star. when i mentioned to others, they said they didn't pay any attention to sky. i lost sight of it the moment its path passed behind a building, the same way i noticed it as it appeared.