Actually, what they do is when the DOT does a roadside inspection in a rest area or weigh station, they check the opacity of the exhaust flow. Pretty simple really and if you don't pass, the fun begins. Of course that only applies to Tier 4 final trucks.
They have this neat little instrument that measures it. What they do is have the driver throttle the engine from idle to governed speed and they check for visible particulates.
If the engine fails, you are in deep do do.
I don't see that ever happening to to tractors though. Highly unlikely to have a 'Barney Fife' driving down the road with a meter checking tractors.
They have this neat little instrument that measures it. What they do is have the driver throttle the engine from idle to governed speed and they check for visible particulates.
If the engine fails, you are in deep do do.
I don't see that ever happening to to tractors though. Highly unlikely to have a 'Barney Fife' driving down the road with a meter checking tractors.