The roads in Microsoft Streets & Trips are drawn in segments. It would be GREAT to hold down the ALT key or some other trigger, and then hover over a road with the mouse. The road would be highlighted in red. Clicking on the road would "set" it as a road to avoid when planning routes. The avoidance could be turned off using the same process. This would be GREAT in situations where a city is replacing water pipes, and the road needs to be avoided for a few weeks, but not permanently.