We've been creating geometry from a road geometry service to display travel routes on our map. We also have a layer of known routes. We're working on trying to speed things up by using the known routes in a JSAPI map, and calling the road geometry service only when we need to update or add routes.
Using the road geometry service, we can draw the route so that when a vehicle is shown on the route, the road already traveled can be red, and the remaining route as green. Has anybody tried to render lines with different symbols on different parts of the line?