… and end. Roads are often closed long before an event starts and long after it ends. With crashes or construction, there may not even be a fixed end time. Some events, like marches, are especially complicated. Marches don’t stay in one place, and … an eye out to replace any signs that get taken down. (It happens.) For big detours with lots of advance notice, like DTLA May Day events, we might post Rider Alerts on board our buses (right behind the operator’s seat). All of our detours are …