I have a question....is Naperville a big city...I get really nervous when driving in big cities and haven't done it often, I mean I get nervous driving in Madison (WI), how many people are in Naperville?
It is a little over 140K, according to 2010 census.
Traffic volume tends to be consistent, if lighter, at off-peak hours. I worked up in this area for roughly two years and it was rare not to see a few cars at a stop light at any given time. The main travelled road to get places is I59. It runs almost from I80 up to, iirc, where you and Chiro are inbound from.
I would recommend that the two of you arrive earlier rather than later if the traffic may bother you. A bit of advance notice as well: the street the bookstore doesn't have an overabundance of parking spots. It looks to be more like something I see here in downtown Morris.
I'll be heading up that way either today(Tuesday) or Wednesday to see what I can see. I'm gonna stop in the bookstore too to have a look around.
I'm hoping it's like the Tardis: bigger on the inside cause we are going to fill it, methinks.