In the UK at the moment, heavy trucks have speed Limiter devices fitted, hence the bunching that we often see on Motorways when one 56 mph governed truck tries to pass another doing 56 mph. Following motorists are often puzzled by the need for such a manoeuvre and then frustrated at the delay. Read the whole story...
http://www.johnfife.co.uk/2012/07/blethers-speed-limiters.html
Use This link to Override Speed Limiters on Most big Trucks. http://fastertruck.com/products/SafetyPass-Pro-XM6KT.html
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