Can TNM model vehicle deceleration?
TNM does not have a function that allows you to model true deceleration. Some users believe that by putting a traffic control device on the other end of a roadway, therefore reversing the direction will decelerate the vehicle instead of accelerating it. This is not true. Modeling a roadway in the reverse direction will cause vehicles to accelerate away FROM the flow traffic device. This would reverse the direction of traffic flow, and would produce emission levels and frequency spectra acoustically different from deceleration. Roadways must always be digitized in the direction of traffic flow. Although TNM does not have a function that allows you to model true deceleration, sound users have tried decreasing sound levels in TNM by breaking a roadway into multiple segments with decreasing speeds. Please note that although this does lower sound levels, it will produce emission levels and frequency spectra acoustically different from real life deceleration. Also, keep in mind that a decrea
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