本文件评估了当前工程测试和模拟标准以及用于确定单车系统燃油效率、货运效率和排放量的方法，单车系统主要由额定车辆总重超过10000磅（4535千克）的公路卡车和公共汽车组成。本文件为多车辆系统中讨论的每个测试和仿真标准、方法和技术的适用性和使用提供了指导。

This document provides an assessment of current engineering test and simulation standards and methods used to determine the fuel efficiency, freight efficiency and emissions of single-vehicle systems comprised primarily of on-road trucks and buses with GVWR of more than 10000 pounds (4535 kg). This document provides guidance on the applicability and use of each test and simulation standard, method and technology discussed for multi-vehicle systems.