Accidents and disasters caused by various means of transportation affect many lives and properties. Transportation safety can be influenced by defective vehicles (e.g., cars, trains, ships), environmental status (e.g., wind, snow, low temperatures), disruption to transportation infrastructures (e.g., bridges, tunnels, roads) and human error. Transportation safety services based on Internet of things (IoT) technologies can reduce the occurrence of accidents and disasters, and save the lives and damage to properties. This draft Recommendation describes a transportation safety management model and an architectural framework for transportation safety services based on the IoT reference model.