Document ID: chunk:federal_register_of_legislation:F2018L01515:body:0:p5
Version: federal_register_of_legislation:F2018L01515
Segment Type: other
Provision Reference: 
Character Range: 15163–18150

or external control of steering. Therefore, the Regulation does not permit the general approval of systems that incorporate functions by which the steering can be controlled by external signals, for example, transmitted from roadside beacons or active features embedded into the road surface. Such systems, which do not require the presence of a driver, have been defined as "Autonomous Steering Systems".
 This Regulation also prevents the approval of positive steering of trailers by means of electrical control from the towing vehicle as there are currently no standards applicable to this application. It is expected that at some time in the future, ISO 11992 will be amended to include messages associated with the transmission of steering control.
1.  Scope
1.1. This Regulation applies to the steering equipment of vehicles of categories M, N and O.[1]
1.2. This Regulation does not apply to:
1.2.1. Steering equipment with a purely pneumatic transmission;
1.2.2. Autonomous Steering Systems as defined in paragraph 2.3.3.;
1.2.3. Steering systems exhibiting the functionality defined as ACSF of Category B2, C, D or E in paragraphs 2.3.4.1.3., 2.3.4.1.4., 2.3.4.1.5., or 2.3.4.1.6., respectively, until specific provisions would be introduced in this Regulation.
2.  Definitions
 For the purposes of this Regulation:
2.1. "Approval of a vehicle" means the approval of a vehicle type with regard to its steering equipment.
2.2. "Vehicle type" means a vehicle which does not differ with respect to the manufacturer's designation of the vehicle type and in essential characteristics such as:
2.2.1. Type of steering equipment, steering control, steering transmission, steered wheels, and energy source.
2.3. "Steering equipment" means all the equipment the purpose of which is to determine the direction of movement of the vehicle.
 The steering equipment consists of:
 - The steering control,
 - The steering transmission,
 - The steered wheels,
 - The energy supply, if any.
2.3.1. "Steering control" means the part of the steering equipment which controls its operation; it may be operated with or without direct intervention of the driver. For steering equipment in which the steering forces are provided solely or partly by the muscular effort of the driver the steering control includes all parts up to the point where the steering effort is transformed by mechanical, hydraulic or electrical means;
2.3.2. "Steering transmission" means all components which form a functional link between the steering control and the road wheels.
 The transmission is divided into two independent functions:
 The control transmission and the energy transmission.
 Where the term "transmission" is used alone in this Regulation, it means both the control transmission and the energy transmission. A distinction is drawn between mechanical, electrical and hydraulic transmission systems or combinations thereof, according to the means by which the signals and/or energy is transmitted.
2.3.2.1.