What requirements do tiedown and restraint products need to meet to comply with the wheelchair tiedown and occupant restraint standards? (WC18 and ISO 10542)

The biggest difference between the two standards is the WC18 requires testing with a wheelchair-anchored crashworthy lap belt while ISO 10542-1 allows this configuration but does not require it. Testing with a crashworthy, wheelchair-anchored lap belt requires the WTORS to demonstrate a higher level of strength. Although there are some differences between the US WC18 and the ISO 10542-1 standards, the general requirements and test methods are essentially identical and may be summarized as follows:

The standards apply to WTORS:

  • that include all different types of wheelchair securement systems,
  • with belt-type occupant restraint systems,
  • for both passengers and drivers (adults only-ISO),
  • for use in both public and private vehicles,
  • for use with all wheelchairs including scooters, and
  • for use with forward-facing wheelchairs in the vehicle.

The standards require that:

  • pelvic and shoulder restraints be used in the tests and recommend use of both belts during transport, especially in vehicles that have occupant restraint belts normally installed,
  • a dynamic 30 mph (48kph) frontal-impact test be used to confirm the performance of the WTORS,
  • the end fittings on tiedown straps meet a specific design so that the end fitting will readily latch to the mating receptacle on the transport-compliant wheelchair,
  • the product be permanently labeled as to the test passed,
  • instruction and warnings be provided for both installers and users.