ISO 15638-25:2024

Overview

ISO 15638-25:2024 - "Intelligent transport systems - Framework for collaborative telematics applications for regulated commercial freight vehicles (TARV) - Part 25: Overhead clearance monitoring" defines a conceptual framework for providing overhead clearance monitoring and safety advisory information to freight vehicle drivers and operators. Intended primarily for non-enforcement (unregulated) use but also applicable to regulated application services (RAS), the standard supports remote provisioning of vehicle height/clearance information to reduce bridge strikes and improve road transport safety.

Key technical topics and requirements

• Service concept and scope: Framework for a freight vehicle safety information provisioning service focused on overhead clearance (vehicle height vs. bridge girder bottom).
• Unregulated vs regulated use: Designed for non-enforcement safety advisory services; can be adapted to regulated deployments where jurisdictions require monitoring.
• Data sources and sensors: Use of vehicle-provided height data and roadside sensors (mounted at bridge low points) to detect potential clearance conflicts.
• Roles & CONOPS: Definitions of participants and interactions - drivers, vehicle operators, application service providers (ASP), prime service providers, jurisdictions, roadside units and ITS stations.
• Sequence of operations: Conceptual transaction flows and sequences for delivering advance warnings and real-time messages to vehicles or infrastructure (e.g., VMS, roadside units).
• Quality of Service (QoS) & testing: Requirements for QoS, test regimes, marking/labeling, and approval processes (including roadside sensor approval).
• Security & data control: References to system security and data access policies (aligned with ISO/TS 15638-4 and related TARV parts).
• Software & auditability: Emphasis on software engineering quality systems, monitoring, audits, and operational quality monitoring stations.

Practical applications and users

• Road authorities and jurisdictions: Implement roadside sensor networks, provide infrastructure data and management for public roads.
• Telematics & service providers: Build TARV overhead clearance services that ingest vehicle height data and generate advance advisories.
• Freight operators and drivers: Receive pre-trip or real-time warnings about potential low-clearance hazards to prevent bridge strikes.
• Infrastructure managers / bridge owners: Integrate with variable message signs (VMS) and roadside units to warn non-equipped vehicles.
• ITS integrators and vendors: Develop ITS stations, roadside sensors, and in-vehicle systems compliant with the TARV framework.

Related standards

• ISO 15638 series (TARV) - framework for telematics applications for regulated vehicles
• ISO/TS 15638-4 - System security requirements
• ISO 15638-5 - Generic vehicle information
• ISO 15638-7:2013 - Other applications
• ISO/TS 14812 - ITS vocabulary

Keywords: ISO 15638-25, overhead clearance monitoring, TARV, intelligent transport systems, freight vehicle safety, overheight detection, roadside sensors, vehicle height data, telematics applications for regulated vehicles.