two thirds of a road train.  They buffet the car a little - the speed limit is 130 km/h
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/82289516@N00">jojo</a> from Australia
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jojof/3056302242/">Darwin 2008</a>