SITE SELECTION: Identify a minimum of five unique measurement sites for each vehicle type.
Characteristics of the Selected Sites:
Describe the identified measurement sites, including the approximate ambient noise level at each site.
Identify the locations of all measurement microphones.
Observer Station Location:
Identify the location of the observer station relative to the microphones, as well as the location of all instrumentation at the observer station.
Indicate which FHWA TNM vehicle types and/or user-defined vehicle types will be measured.
INSTRUMENTATION: List all equipment to be used in the measurements, including the manufacturer, model, and date of last calibration, if applicable, for each item.
Identify the rise and fall in the noise-level time-history trace for each event. (NOTE: An instrument capable of measuring and storing the sound level time history, e.g., a graphic level recorder, must be used to establish event quality, and measurements may only be made for vehicles passing in the nearest lane of travel).
Indicate the minimum separation-distance between vehicles, which will be used for each event. (NOTE: A minimum separation distance of 400 feet between like-vehicles and a minimum separation distance of 1,000 feet between automobiles and heavy trucks are required).
Number of Samples:
Identify the minimum number of samples which will be obtained for each vehicle type across the speed range of 10-70 mph, in 10 mph increments. (NOTE: 2,825 automobiles, 765 medium trucks, 2,986 heavy trucks, 355 buses, and 39 motorcycles were sampled in the development of the national REMELs).
MEASUREMENT PROCEDURES: Describe the step-by-step procedures which will be used for all field measurements.
Calibration and Compilation:
Show how the measurement data will be adjusted for calibration drift and merged for analysis and the development of REMEL regression equations.
Development of REMEL Regression Equations:
Show how regression analysis of the measurement data will be used to develop a REMEL equation for each vehicle type.