Transport tractors, as vehicles integrating agricultural and transportation functions, have strict specific safety standards formulated by major countries and international organizations. These standards cover key aspects such as protective structures, braking systems, control systems, and lighting equipment.
International Standards
International standards lay a unified technical foundation for the safety of transport tractors, focusing on control systems and basic protective technologies:
ISO 4254 Series: This is a core standard for the safety of agricultural and forestry tractors. Among them, ISO 4254 - 3 focuses on the safety requirements of transport tractors, specifying technical indicators for roll - over protective structures (ROPS) and power take - off (PTO) devices. For example, the protective cover of the PTO shaft must have sufficient load - bearing capacity to prevent operators from being injured by rotating parts during transportation and operation switching.
Other parts of the series also set safety standards for key components involved in the transportation process, such as transmission systems and traction devices.
ISO 25119 - 1:2018 and ISO 25119 - 3:2018ISO: These two standards focus on the safety - related parts of the control systems of transport tractors.
They clarify the design and development principles of electrical, electronic, and programmable electronic control systems, covering risks such as electromagnetic interference and system malfunctions.
For instance, they put forward requirements for the current - limiting design of hybrid transport tractors to avoid electric shock or fire hazards caused by insulation failures.
ISO 25119 - 3 further supplements the technical specifications for the batch production, hardware, and software of the control system to ensure the stability of the safety functions during the mass production of tractors.
European Union Standards
The EU's safety standards for transport tractors are centered on type - approval regulations, with comprehensive and detailed requirements covering the whole vehicle and components:
Regulation (EU) No 167/2013EUR-Lex: As a core regulation, it covers almost all safety aspects of transport tractors. It requires the tractor to have sufficient structural integrity; the ROPS and falling - object protective structure (FOPS) must pass strict impact tests to protect the driver in case of roll - over or falling objects during transportation.
Meanwhile, it specifies the safety requirements for the driver's operating space, visibility, and emergency stop devices, and also imposes standards on lighting, tires, and brakes to ensure the safety of tractors during road transportation. Its revised version (EU) 2019/519 further clarifies the safety parameter differences between different types of wheeled transport tractors.
Machinery Directive 2006/42/ECEUR-Lex: When the above - mentioned regulations do not cover the safety risks of trailers and auxiliary machinery pulled by transport tractors, this directive shall be applied. For example, it supplements the safety requirements for the connection structure between transport tractors and trailers, requiring the connection part to withstand the tensile force and impact force during transportation and avoid separation accidents.
United States Standards
U.S. standards focus on key safety points such as braking performance and protective structures, with clear mandatory indicators:
49 CFR Part 571: This standard has strict regulations on the braking performance of heavy transport tractors. Most new heavy - duty transport tractors, when loaded to the rated total mass and traveling at 96.6 km/h (60 mph), must stop within 76.2 meters (250 feet), which is a 30% reduction compared with the previous standard. For a small number of ultra - heavy transport tractors, the maximum braking distance is relaxed to 94.5 meters (310 feet). In addition, when loaded to the light load weight, the braking distance shall not exceed 71.6 meters (235 feet).
29 CFR Part 1928eCFR: It focuses on the safety of ROPS and seat belts. Transport tractors with an engine power of more than 20 horsepower must be equipped with ROPS that meets the test requirements. The ROPS of wheeled tractors shall comply with the relevant load - bearing and impact test standards, while that of tracked tractors shall meet the special structural strength requirements. The supporting seat belt must conform to the SAE J4C standard, and the seat belt anchor must withstand a static tensile load of 453.6 kilograms (1000 pounds) to ensure that the driver is not thrown out when the tractor rolls over.
Chinese Standards
Chinese standards are mainly based on mandatory national standards, covering the whole vehicle, components, and operating safety, with strong pertinence to the domestic use scenario:
GB 16151.1 - 2008: This is a mandatory standard for the operational safety of transport tractors. It specifies the limit of the external dimensions of the tractor transport unit. For example, the length of the unit with an engine power of no more than 58kW shall not exceed 10 meters, the width shall not exceed 2.5 meters, and the height shall not exceed 3 meters. It also requires that dangerous parts must be equipped with protective devices and safety signs, the cab should be equipped with a safety frame and fire extinguisher, and the driver's position noise must meet the test standards.
GB 18447.1 and GB 18447.2: The former stipulates the safety requirements for wheeled transport tractors, including the strength of the body frame, the sealing of the chassis, and the protection level of the transmission system. The latter targets hand - held transport tractors, specifying the safety indicators of the steering handle, braking device, and traction connection part to prevent accidents such as loss of control during short - distance transportation.
GB 4785: It specifies the installation standards for external lighting and light - signal devices of transport tractors. For example, the position, brightness, and warning function of the front lights, turn signals, and brake lights must meet the requirements to ensure that the tractor can be clearly identified by other vehicles during day and night transportation.
