Road traffic information server and road traffic information system

摘要

Provided are a server and a system that are capable of generating road traffic information on traffic congestion in a more appropriate manner, considering actual road traffic conditions. If a vehicle speed V falls below a first reference speed V₁ and then exceeds a second reference speed V₂ (V₁), then a traffic congestion situation is estimated based on an inference that the vehicle is highly likely to have escaped from traffic congestion. To estimate a traffic congestion situation, it is required that a situation in which the vehicle speed V exceeds the second reference speed V₂ continue for a second specified distance or more or for a second specified time T₂ or more.