Cyclists film themselves drafting a truck - don't try this at home!

Two Brazilian cyclists have posted a video on YouTube showing them drafting a truck at speeds of up to 124 km/h (approx 77 mph).

One of the riders sticks a Go Pro camera to the back of a truck as it drives slowly up a long, three lane climb. The pair ride on the rear bumper of the truck as it climbs the hill before descending behind it down the other side.