grounding and loose ballastThere are grounding wires in the pit where the vehicle stops, just like in a toll booth lane. Montreal GP, almost a F1 generation ago, when Hakkinen drove a McLaren-Mercedes, corner workers (USA for marshals) discovered what was being used for ballast. A hunk of depleted uranium departed the McLaren in a corner. It took a good sized gouge out of the pavement, before skipping into the usual tire barrier. The struck tire had a bowling ball sized dent in its side. Said tire was about 60 cm (2 ft) to the side of a hole in the catch fence where an observer was stationed. F1 uses supercomputers to model a race weekend and during the event to adjust tactics and strategies.