How fast can you find out if there's a problem with the piping?

One underground pipe is missing from the Petroleum Gas line.

Since this new method highlights ALL pipelines, it does nothing to help identify this. In fact, it works againt us by making it seem that all lines are connected.

And no, I don't think going through each of the five lines clicking checkboxes or pressing keys is a decent solution.

Bring back mouseover display.