Figure 10. Vehicle emissions measurement plan view. A two-lane roadway is depicted with the direction of travel to the right. A 120-meter distance marker is located at the leftmost point of the roadway. To the right of that marker, off the road, is the observer and instrumentation. A radar device is located next to the observer and as pointed diagonal down the roadway in the direction of travel. A microphone is located 120 meters to the right of the observer and 15 meters from the center of the closest lane of the road.

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