A flat tire can be dangerous and damaging. Continuing to drive on a tire after it has gone flat will potentially damage the rim, costing much more than it initially would have. In addition to this, driving with a flat tire can become a serious risk of accident. There are many factors that can contribute to a flat, including weather, screws, or other environmental factors. Know how to check the air with the tire gauge. There are many gas stations around town that offer free fill up as well.