but it can also be a substantial risk if they lose or abuse it. see humpback bridge, the only covered, humpback bridge remaining in the united states (photo on this page). this step is very crucial as we are able to see in real time what the final product will look like as we are working on it. what the hell is wrong with you!!! i will pass along general ideas of information and things to watch out for. heat and tyre rubber do not go well together, as it is one of the primary causes of failure. 