Hi CEP: Response to your A to Z quiz comment: A 5 or 10 second version of this quiz would be great fun, but unfortunately quiz times have to be in 15 second multiples. You may want to try Typing AA to ZZ and Typing A to Z With Your Left Hand Only. Now, I must have a go at this interstate quiz while I'm here! I'm pretty sure there are duplicate numbers (eg there's an I-84 in the East and the West) but let's see how it goes...
And THIS quiz has the opposite issue! A minute or 5 more maybe? I didn't even have time to read I-5/I-84, let alone answer it, which is a bummer cos I've driven that junction many times.