Abstract
In order to provide drivers with useful and correct information, algorithms to calculate travel-times and queue-lengths have been developed. Input to these algorithms are detector loop measurements of speeds and flows. The algorithms were validated by comparing the outcome of the algorithms with real data, recorded with another system. The results of this validation are described in this paper. Also the algorithms are briefly outlined. The findings are that in the common cases (short and long-closed road-segments) the estimation of travel-time is satisfactory. The queue-length estimator for long closed road-segments seems also adequate. The algorithm doesn't function for open-long segments and with large absences of the input data. (A*)