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Old 20th June 2008, 21:13   #1
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Default Signs saying "No engine brakes" - Why?

I have seen sign boards that say "Do Not Use Engine Brakes" on quite a few roads on the US. I have never really understood this but my closest guess would be noise pollution? Can anybody elaborate?
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Old 20th June 2008, 21:57   #2
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Arrow noise & slip

Yes, you've understood correctly. That's a warning for trucks.
It's mostly due to the loud noise that engine brakes produce when engaged but the warning may also be displayed in case there's a chance of slipping (eg. icy roadways).

For technical details on engine brakes, you can look up Google.

Ever heard a sudden loud noise - like a machine gun going off inside your head - while driving on the freeway? That's the semi in the next lane using his engine brake.
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Old 21st June 2008, 00:27   #3
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Here are couple of you tube videos on jake braking trucks.

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Old 21st June 2008, 19:49   #4
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Engine brakes with trucks is something to do with opening the exhaust valves to TDC to slow down the engine hence reducing the brakes without actually applying the brakes.
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Old 23rd June 2008, 03:54   #5
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According to the 2nd video it does sound like machine gun being fired.
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