Montreal. There's someone with a YouTube channel named TaiigerBlue that posts "FSD tests" from all around the city.
EDIT: I didn't know what "caltrops" are. And anyway any kind of damage to a precious motorized vehicle is considered a grave offense. I once hit the rear bumper of a car that cut me with my bike wheel and the driver chased me, cut me again, got out of his car, yelled at me, and then slapped me in the face, saying "YOU DON'T TOUCH MY CAR BRO!1!"
Oh! I assumed it was a short for a location in California or something like this. I didn't know the word for those things and thought it was a place.