1.1 本规程涵盖了纵断面测量的数学处理，以产生主观行驶质量的估计值，称为行驶次数（RN）。 1.2 本规程旨在为公路界提供一种标准规程，用于计算和报告公路路面主观行驶质量的估计值。 1.3 该实践基于国家公路合作研究项目（NCHRP）1-23中开发的算法 ( 1. ， 2. ) ， 2. 俄亥俄州交通部的两个乘车质量研究项目 ( 3. ， 4. ) ，以及参考文献中介绍的工作 ( 5. ， 6. ) 。 1.4 在NCHRP研究项目1-23中，这种做法产生的主观行驶质量的计算估计被命名为行驶次数（RN） ( 1. ， 2. ) 以将其与根据纵向轮廓计算的行驶质量的其他测量区分开来。 Eq 1 属于 8.2 表示行驶次数的数学定义。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该实践提供了一种方法，用于使用纵向轮廓测量设备获得路面特性的定量估计，该特性定义为行驶质量或可行驶性。 5.1.1 乘坐次数（RN）是便携式的，因为它可以从各种仪器获得的纵向轮廓中获得。 5.1.2 RN随着时间的推移是稳定的，因为真正的RN是基于真实纵向轮廓的概念，而不是特定类型仪器的物理特性。 5.2 行驶质量信息是交通机构维护的路面管理系统（PMS）的有用输入。 5.2.1 已经确定了这种做法产生的主观行驶质量估计值 ( 6. ) 与测量的主观行驶质量高度相关（r＝0.92），并且产生行驶质量估计的低标准误差估计（0.29RN单位）。 5.2.2 在实验中包括的变量范围内，这种做法产生的主观行驶质量估计在路面类型、道路等级、车辆尺寸、车辆速度（在公布的速度限制内）和区域性方面没有显著差异 ( 1- 4. ) 。 5.2.3 已经发现，通过这种做法得出的主观行驶质量估计值可以很好地预测各种道路分类的非常规道路维护需求 ( 3. ) 。 5.3 使用这种做法从测量的纵向轮廓中产生主观的行驶质量估计，消除了为获得相同的行驶质量信息而进行昂贵的行驶面板研究的需要。

1.1 This practice covers the mathematical processing of longitudinal profile measurements to produce an estimate of subjective ride quality, termed Ride Number (RN). 1.2 The intent of this practice is to provide the highway community a standard practice for the computing and reporting of an estimate of subjective ride quality for highway pavements. 1.3 This practice is based on an algorithm developed in National Cooperative Highway Research Project (NCHRP) 1–23 ( 1 , 2 ) , 2 two Ohio Department of Transportation ride quality research projects ( 3 , 4 ) , and work presented in Refs ( 5 , 6 ) . 1.4 The computed estimate of subjective ride quality produced by this practice was named Ride Number (RN) in NCHRP Research Project 1–23 ( 1 , 2 ) to differentiate it from other measures of ride quality computed from longitudinal profile. Eq 1 of 8.2 represents the mathematical definition of Ride Number. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice provides a means for obtaining a quantitative estimate of a pavement property defined as ride quality or rideability using longitudinal profile measuring equipment. 5.1.1 The Ride Number (RN) is portable because it can be obtained from longitudinal profiles obtained with a variety of instruments. 5.1.2 The RN is stable with time because true RN is based on the concept of a true longitudinal profile, rather than the physical properties of particular type of instrument. 5.2 Ride quality information is a useful input to the pavement manage systems (PMS) maintained by transportation agencies. 5.2.1 The subjective ride quality estimate produced by this practice has been determined ( 6 ) to be highly correlated (r = 0.92) with measured subjective ride quality and to produce a low standard estimate of error (0.29 RN units) for the ride quality estimate. 5.2.2 The subjective ride quality estimates produced by this practice were found to be not significantly different with respect to pavement type, road class, vehicle size, vehicle speed (within posted speed limits), and regionality over the range of variables included in the experiment ( 1- 4 ) . 5.2.3 The subjective ride quality estimates produced by this practice have been found to be good predictors of the need of non-routine road maintenance for the various road classifications ( 3 ) . 5.3 The use of this practice to produce subjective ride quality estimates from measured longitudinal profile eliminates the need for expensive ride panel studies to obtain the same ride quality information.