I know that we all do this.
Driving to work on the freeway, picking out a car ahead of us, lining it up with a spot on our windshield, estimating the range for a nice tracking shot with our 50's or for landing a few cannon rounds . . .
Of course, our windshields lack the gunsight rings for estimating range of the enemy.
I did an estimate in my head, but (more precisely on paper) 60 mph = 30 yards per second. So, you can hold pace behind your adversary and start counting when he crosses a sign or post or spot on the road -- "one Mississippi, two Mississippi", etc., until you cross the same mark -- and then figure out how many yards away he is.
This way, I can see while driving to work what a shot at 400 yards is like vs. 200 yards or whatever.
So, when driving to work, remember: 30 yards per second.
