I drive up and down Highway 61 in Missouri nearly every single day of my life. I recently saw a large nest near LaGrange and looked at my wife who saw it, too. It wasn't squirrels up in that tree either.
If you need evidence that it's best to stay off the highways and roads today, take a look at this. A new video shows that Highway 61 in Missouri is at a complete lockdown due to ice.
It's one of those aspects of life that you see practically every day, but don't take the time to ask the question "why?". It's the rhyme and reason behind why our highways have the numbers they do including Highway 61, 172, 70, etc.