ISO 8608-2016 PDF

Full title and description

Mechanical vibration — Road surface profiles — Reporting of measured data (ISO 8608:2016). Specifies a uniform method for reporting measured vertical road profile data for one-track or multiple-track measurements on roads, streets, highways and off‑road terrain; measurement hardware and detailed measurement methods are not prescribed.

Abstract

ISO 8608:2016 defines the required content, data formats and conventions for reporting vertical road surface profile measurements. The standard promotes consistent representation of road profile data using displacement power spectral density (PSD) and related descriptors, prescribes smoothing/banding conventions (octave, one‑third‑octave, one‑twelfth‑octave), provides road roughness classification tables, and lists minimum metadata about the measuring system and test conditions needed for meaningful comparison and reuse of measured profiles.

General information

• Status: Published, current (confirmed at review).
• Publication date: 4 November 2016 (ISO second edition, 2016-11).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 17.160 (Vibrations, shock and vibration measurements); 93.080.10 (Road construction).
• Edition / version: Edition 2 (2016).
• Number of pages: 36 pages.

Scope

Specifies a uniform method for reporting measured vertical road profile data for one-track and multiple-track measurements on roads, streets, highways and off‑road terrain. Excludes rail-track data. The standard states what must be reported (data types, PSDs, smoothing bands, road classification, test metadata and measuring‑system characteristics) but does not mandate specific measurement instruments or measurement procedures.

Key topics and requirements

• Primary descriptor: displacement power spectral density (PSD) of vertical profile; acceleration PSD may be reported as an alternative.
• Specification of PSD presentation and mathematical relationships (displacement ↔ acceleration) and spatial‑frequency units.
• Smoothing/banding requirements: octave bands (up to 0.0312 cycles/m), one‑third‑octave bands (up to 0.25 cycles/m), and one‑twelfth‑octave bands at higher frequencies.
• Requirements to document measuring system characteristics and to correct/decolour PSDs for measuring‑system transfer functions where applicable.
• Road roughness classification (road classes A–H) with tables of PSD and r.m.s. displacement limits for octave bands to support simulation and comparison.
• Standardized content for report sheets and minimum metadata (sampling, processing parameters, test conditions, track positions, photos, etc.).
• Informative annexes with example reports, characterization/fitting guidance and practical considerations for FFT/precision and tyre‑envelope effects.

Typical use and users

Used by vehicle, suspension and tire engineers for NVH and ride‑comfort simulation; pavement engineers and road authorities compiling surface-condition or inventory data; researchers modelling vehicle–road interaction; test laboratories exchanging profile datasets; and specialists generating standardized road inputs for simulation, durability and noise assessments.

Related standards

Commonly referenced and related documents include ISO 2041 (vibration vocabulary/terms), IEC 61260‑1 (octave and fractional‑octave filters specifications), ISO 2631 series (human exposure to whole‑body vibration) and technical documents on pavement texture and profile measurement (for example ISO/TS 13473‑4 and regional standards adopting ISO 8608). National/adopted versions exist (for example BS ISO 8608:2016).

Keywords

road surface profile, road roughness, power spectral density (PSD), displacement PSD, spatial frequency, smoothing bands, road classes, pavement profile, vibration measurement, reporting conventions, ISO 8608

FAQ

Q: What is this standard?

A: ISO 8608:2016 is an international standard that specifies how measured vertical road surface profile data should be reported so that data from different sources are comparable and can be used consistently in simulation and analysis.

Q: What does it cover?

A: It covers the content and format of reported data (primarily displacement PSDs), smoothing/banding conventions, road‑roughness classification tables, minimum metadata about test conditions and measuring systems, and example report formats. It does not prescribe specific measurement equipment or detailed measurement procedures.

Q: Who typically uses it?

A: Vehicle and suspension engineers, tire manufacturers, pavement engineers, road authorities, test laboratories, and researchers needing standardized road profile inputs for simulation, design, testing and comparison.

Q: Is it current or superseded?

A: ISO 8608:2016 is the current (second) edition published on 4 November 2016. It superseded ISO 8608:1995. The edition has been subject to ISO review cycles and was confirmed in subsequent reviews; it remains the active edition as of March 2, 2026.

Q: Is it part of a series?

A: It is a standalone ISO document within the mechanical‑vibration family (ISO/TC 108/SC 2) and is used alongside related standards on vibration terminology and measurement (for example ISO 2041 and the ISO 2631 series) and regional/national test methods for pavement and profile measurement.

Q: What are the key keywords?

A: Road surface profile, road roughness, power spectral density (PSD), spatial frequency, smoothing, road classes (A–H), vibration measurement, reporting.