* Like a river of steel that has turned to molasses. (Emphasizes slow movement)
* Like a giant, slow-moving serpent, snaking its way through the city. (Emphasizes the length and winding nature)
* Like a swarm of angry bees, each car buzzing with frustration. (Emphasizes the feeling of being trapped and agitated)
* Like a giant, metal puzzle, with each car stuck in its place. (Emphasizes the feeling of being trapped and unable to move)
* Like a slow, agonizing dance, where every car takes turns inching forward. (Emphasizes the frustrating lack of progress)