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| Document Title | Suggestion on how to implement the outcome of the GTB Visibility and Glare Study in Regulation No. 48 | ||||||||
| Reference Number | GRE-72-07 | ||||||||
| Date |
17 Oct 2014
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| Summary | During the 71st session of GRE, the experts from GTB presented the outcome of a study on visibility and glare of automotive low beam headlamps; see informal document GRE-71-32. The study concentrated on levelling in relation to load. The major objectives of the study were to improve the understanding of different factors that influence visibility and glare and to identify results of the study that might reveal alternatives for automatic static levelling. The deciding factors in headlamp glare have been determined to be the vehicle pitch angle, loading conditions and initial headlamp aim. Therefore, this proposal looks at replacing the light source technology and the light source 2,000 lm criterion in UN Regulation No. 48 as criteria for the requirement for automatic levelling with performance requirements based upon these deciding factors. | ||||||||
| Source(s) | GTB | ||||||||
| Rulemaking Area(s) | UN R48 Installation of Lighting | ||||||||
| Meeting(s) | |||||||||
| Related Documents | |||||||||
| GRE-71-32 | GTB Task Force: Coordination of Automotive Visibility and Glare Studies | ||||||||
| GRE-72-23/Rev.1 | Poland comments on GTB suggestions for implementing the GTB Visibility and Glare Study in Regulation No. 48 | ||||||||
| VGL-01-02/1 | EC comments on the draft VGL informal group terms of reference | ||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | .docx format | |||||||
| Excerpts from session reports related to this document | |||||||||
| GRE | Session 72 | 20-22 Oct 2014 |
9. Taking into account the recent GTB study (GRE-71-32), the expert from France proposed to delete a design restrictive requirement for an automatic levelling device for all headlamps with LED light sources, irrespective of their luminous flux (ECE/TRANS/WP.29/GRE/2014/34). GRE agreed that this proposal should be tackled at the next session, in conjunction with the GTB proposals on visibility and glare issues (see para. 14 below). 14. The expert from GTB recalled the outcome of the GTB study on visibility and glare (GRE-71-32) and presented a first draft of amendments to Regulation No. 48 addressing the visibility distance and glare issues (GRE-72-07). This proposal received comments by the expert from Poland (GRE-72-23-Rev.1). Various experts generally agreed that the current requirement for automatic levelling in Regulation No. 48 (2,000 lm luminous flux of the light source) should be replaced by other deciding factors for headlamp glare, such as the vehicle pitch angle, loading conditions and initial headlamp aiming. However, no consensus was reached on exact replacement criteria. The expert from UK suggested that an informal group be established to speed up the finalization of the amendment proposal. The experts from France, Germany, Italy and the Netherlands were of the view that GTB should be tasked to submit a concrete proposal to the next session of GRE. GRE invited GTB, OICA and interested Contracting Parties to organize a meeting with the aim to elaborate a revised proposal. The experts from France, Germany, Italy, Netherlands, Poland and UK expressed their interest in participating in this meeting. |
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