Having just made the drive down from The Yuma crossing (which was simple to say the least) I found it to be a relaxing serene and Tranquilo. At this particular juncture it is definitely good to TRY and get out of your comfort zone wherever you travel in the world! The toll road is the way to travel in Mexico when driving South in my opinion only. Be safe and at the same time be aware of your surroundings.
Maybe take the time to google the homicide rate in Chicago, you will be shocked!!! Viva Mexico...
The boogie man is always out, no matter where you are!