Abstract
Travel time information - representing traffic conditions at network level - plays an important role in Dynamic Traffic Management. This paper examines methodologies used within the Telematics Application Programme project DACCORD for online estimation/prediction of travel times using induction loop detectors. A classification of available online methods within DACCORD is presented as well as the DACCORD test sites at which they are applied. It is argued that the choice of methodology in a particular situation depends on two criteria. The simplicity of the methodology is weighed against the quality of the travel time. The quality of the travel time in turn depends on the traffic conditions. (A)