BS ISO 26684 pdf download – Intelligent transport systems(ITS)—Cooperative intersection signal informationand violation warning systems(CIWS)— Performance requirements and test procedures.
6.2.2 Criterion (2): RSE deactivation
When the RSE operator or the automatic system turns RSE ofT to discontinue the system due to failures and maintenance, etc.. it becomes inactive.
6.2.3 Criterion (3): OBE activation
The OHE becomes active when the accessory/ignition switch is turned on. In systems with an optional ON/OFF switch, the OBE becomes active when this switch is turned on.
It might also transition to the active state again when a failure period ends.
6.2.4 Criterion (4): OBE deactivation
The ORE becomes inactive when the accessory/ignition switch is turned off or during failure periods. In systems with an optional ON/OFF switch, the ORE becomes inactive when this switch is turned off.
6.2.5 Class II criterion (5): Warning activation
For the warning in Class II. the warning shall be given when passing the area or time in which warnings are required based on the reception of information from RSE. The warning decision depends on the criteria specified In 6i3.
6.2.6 Class II criterIon (6): Warning deactivatIon
The warning shall be ended when passing the stop line or after the warning criteria are no longer met. for example, because the vehicle has decelerated so that it is no longer in danger ofviolation. The position of the stop line is contained in the message sent by the RSE or stored in the in-vehicle map database.
6.3 Functional requirements of OBE
6.3.1 AcquisitIon of travel directIon
The direction of travel of the vehicle shall be acquired using a position-detection function such as global navigation satellite systems (GNSS) or Information provided from the RSE.
6.3.2 Acquisition of vehicle position
The position of the vehicle shall be acquired using a position-detection function such as GNSS or information provided from the RSE.
6.3.3 Acquisition of vehicle speed
The speed of the vehicle shall be acquired by sensors onboard the vehicle.
6.3.4 Identification of traffic signal information
Information about the state of the traffic signal ahead of the vehicle shall be identified from Information received from the RSE.
6.3.5 judgement of warning necessity and warning contents (Class II)
The decision to Issue a warning and Its contents will be based on the estimated signal phase at the time the subject vehicle arrives at the intersection and on the position and speed of the subject vehicle.
63.2 Provision of information
6.5.2.1 Provision of information to drivers
The system has many ways to provide drivers with information. However, this International Standard focuses on messages to the ORE that will be used to provide the driver with current state of trallic signals (Class I) or warning signals (Class II).
6.5.2.2 Out.of-order indication
In case of system failure detected by the OBE. the driver shall be Informed that the system is not able to provide information.
6.5.3 Warning threshold for signal violation
When a vehicle approaches the intersection, the distance to the intersection where the warning is activated according to the activation conditions. X Is based on the global navigation satellite system (GNSS) data and/or on the information about the vehicle location derived from the RSE location. Then. the time to arrive at the intersection (TTAI) from the distance, can be determined as a junction of the distance and the speed of vehicle, as follows.
BS ISO 26684 pdf download – Intelligent transport systems(ITS)—Cooperative intersection signal informationand violation warning systems(CIWS)— Performance requirements and test procedures
