ISO 16121-4:2011

INTERNATIONAL ISO
STANDARD 16121-4
Second edition
2011-08-01
Road vehicles — Ergonomic
requirements for the driver's workplace in
line-service buses —
Part 4:
Cabin environment
Véhicules routiers — Exigences ergonomiques du poste de conduite
dans les bus de ville —
Partie 4: Environnement dans la cabine

Reference number
©
ISO 2011
©  ISO 2011
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ii © ISO 2011 – All rights reserved

Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Climate, ventilation.2
4.1 Basic requirements .2
4.2 Climate of driver's cab .2
4.3 Ventilation .3
4.4 Windscreen defrosting and demisting .3
4.5 Air quality .3
5 Noise inside the vehicle.3
Annex A (informative) Recommended heating performance .4
Annex B (informative) Recommended performance of a typical cabin air filter .5
Bibliography.6

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16121-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 13,
Ergonomics applicable to road vehicles.
This second edition cancels and replaces the first edition (ISO 16121-4:2005), which has been editorially
revised.
ISO 16121 consists of the following parts, under the general title Road vehicles — Ergonomic requirements
for the driver's workplace in line-service buses:
⎯ Part 1: General description, basic requirements
⎯ Part 2: Visibility
⎯ Part 3: Information devices and controls
⎯ Part 4: Cabin environment
iv © ISO 2011 – All rights reserved

Introduction
Poor ergonomics in the driver's workplace in buses designed to provide scheduled urban and interurban
services increase the already high physical and mental strains on the drivers.
It is the aim of this part of ISO 16121 to supply the designer of line-service buses with information about how
to develop an overall ergonomic concept for the driver's workplace. The recommended requirements on the
driver's workplace for line-service buses made in this part of ISO 16121 are based on the scientific
conclusions of the research project “Driver's workplace in the line-service bus”. This was conducted in
[1]
Germany and summarized in the recommendation VDV 234 . Further comprehensive ergonomic studies
related to the design of an enhanced driver workplace conducted in the United States, Canada, the
[2][3][4][5][6]
Netherlands, Sweden and the United Kingdom have been considered and found to provide
recommendations covering similar areas.
This part of ISO 16121 sets out to consider the practical implications for all ranges of drivers, but particularly
those with statures from 1,55 m (small female) to 2,0 m (large male). These statures include shoes (∼30 mm).
It is also essential that the designer refers to the specifications and requirements of all parts of ISO 16121
(1 to 4) before completing the design of a driver's workplace.
It should be noted that where there is also national legislation covering any of the subjects contained herein,
then both should be complied with. However, if a contradiction between the two should arise in any specific
area, then the legislation shall prevail for that specific point only.

INTERNATIONAL STANDARD ISO 16121-4:2011(E)

Road vehicles — Ergonomic requirements for the driver's
workplace in line-service buses —
Part 4:
Cabin environment
1 Scope
This part of ISO 16121 specifies minimum requirements for the cabin environment.
It applies to the driver's workplace in low-floor line-service buses designed for the carriage of passengers,
comprising more than eight seats in addition to the driver's seat, and having a maximum weight exceeding five
metric tonnes and an overall width exceeding 2,30 m.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 5128, Acoustics — Measurement of noise inside motor vehicles
ISO 6549, Road vehicles — Procedure for H- and R-point determination
ISO/TS 11155-1, Road Vehicles — Air filters for passenger compartments — Part 1: Test for particulate
filtration
ISO 11155-2, Road vehicles — Air filters for passenger compartments — Part 2: Test for gaseous filtration
ISO 16121-2:2005, Road vehicles — Ergonomic requirements for the driver's workplace in line-service buses —
Part 2: Visibility
SAE J381, Windshield defrosting systems
...