So great place to post a really interesting occurance I noticed.
I live in Boston and travel often, taking 93 north, 93 south, and 90 west often. I started a game I keep counting until I see a Tesla, then start counting again. I.e. it's how many seconds it takes to see a Tesla. Going on 93 South, my highest was about 8 minutes. 93 north I forget exactly, but was about 5 or 6 minutes. 90 West highest has been about 90 seconds.
Today from Centre Street Newton (exit 17) to Needham border, about 4 miles, I saw about 8-10 Teslas. There are many more in MetroWest.
On my drives up 93 to Southern NH (West Nashua area) I typically see 5-10. (About 55 miles)
Just the other day I was in a Staples parking lot in Burlington and there were 2 other Model 3s in just the Staples parking section.
I also finally had it happen a month or so back where I had a train of 3 Tesla's caravaning organically on Route 3.
Thus, on certain areas, very common.