Active standard | Published: 01/04/2026

SAE J2978

Truck and Bus Coastdown Procedure

Available languages: English

Available design: electronic design (pdf), Print design

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Detail information

Designation: SAE J2978

Publication date: 01/04/2026

Pages: 0

Country: American technical standard

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Anotation

This document describes a rigorous engineering test procedure that utilizes industry-accepted data collection and statistical analysis methods to determine the road load and to estimate the aerodynamic drag area of trucks and buses weighing more than 10000 pounds. The test procedure may be conducted on a test track or on a public road under controlled conditions and supported by extensive data collection and data analysis constraints. The estimated aerodynamic-drag-area result represents a single-speed and single-yaw-angle condition. Test results that do not rigorously follow the method described herein shall not be represented as an SAE J2978 result.

SUBFILE: Commercial Vehicle
TYPE OF DOCUMENT: Ground Vehicle Standard

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