This one from a reader.

Mr. D—Wow, it’s frustrating trying to find some things – In the early 1990s, I came across a book with a story line like: A university mainframe computer is ‘time shared’ to a local city. Automating all sorts of things, like traffic lights, accounting, etc. A retired FBI type works security at the college, when the computer goes crazy, causing traffic jams by manipulating the signals, etc. Is the computer going haywire, or is someone manipulating it to provoke these events? The ex-FBI guy is on the case, thinks maybe sabotage is involved …
I’ve tried Google, Amazon and an on-line library search at a local library, but can’t find that book – I don’t blog, so I can’t bleg! Ever heard of this work of fiction?

[Me] No, but if Kathryn doesn’t mind, I’ll bleg it on your behalf, Sir. There’s a real need for some sort of thesaurus-type database for stories, that you could search by plot line. Often it’s the only thing you can remember.