Consider the scenario where you manage more than 100 buses in the district. You assign each bus with a primary route and another bus as a standby. While the routes are in session, you experience three breakdowns, and the communication systems that you are running break down. This means that more than 200 Children will be late for schools all around the district. Three of your drivers call in sick, and you cannot get all of the standbys in, they are either unavailable or will get in too late. You switch to contingency and reroute about six buses for the morning schedule that were planned for the afternoon. Your schedule has been disrupted, you're quickly losing time, a few school principals have made calls wondering about the status of some of their kids, you begin to lose your patience as you bark at your staff to deploy the emergency vehicles to make sure everything is running OK.