I remember seeing them test it on Topgear.
We would be driving our 4 cyl rangers flat out at ~100mph at night, completely overdriving the headlights, and these sauds would start flicking their high beams at us when they were a mile behind us. They would be on top of you in a matter of seconds and if you valued your life, you would get the heck over into the 'slow' lane. lol.