It would be useful to be able to display only those street nodes where there are only a given number of nodes left to run. For example, if there were a filter setting you could enter a 1 and when you hit the eyeglass you would only get the nodes on streets that have only 1 remaining node. Entry could be either a slider that goes from 1 to 10+ or a drop down or whatever and the selection would be # of missing nodes or less.
Neat idea for dense/big cities and making your decision of where to run slightly narrower