Truck Noise Levels on Upgrades and a Simple Method for Noise Prediction. Supplemental Report (Final)

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Truck Noise Levels on Upgrades and a Simple Method for Noise Prediction. Supplemental Report (Final)

S. R. Sasor

A simple method for predicting the noise due to heavy trucks on interstate upgrades was developed from mathematical modeling, and the findings of passby and onboard measurements. This method provides speed and noise emission level inputs to the STAMINA 2.0 traffic noise computer program. It predicted the noise from heavy trucks on interstate upgrades more accurately than STAMINA 2.0 alone (1.75 dBA more accurately on average). Truck passby noise measurements were made on a 2 mile long, 4% interstate highway upgrade at one location just before the upgrade and at three locations on the upgrade. Truck noise measurements were also made on upgrades and ramps with a microphone on board a test truck. Heavy truck noise levels measured near the top of the 4% upgrade were more than a decibel (dBA) lower than on the preceding level roadway. Also, speeds measured on the upgrade were considerably higher than those given in the 1985 Highway Capacity Manual. Onboard measurements on ramps indicated that the medium truck's noise level was always less on the various types of ramps than it was on the mainline roadways they adjoined.