Abstract: Considerable errors exist in the road speed data obtained from various detectors and directly influence the accuracy.Various traffic models were established for estimation. 12 groups of field experiments on different classes- roads by using a test vehicle with global positioning system(GPS) modules were implemented. Through combining automatically recording and manually recording, the accuracy discrepancy of travel speed data collected by floating car system, microwave detectors, and loop detectors was attempted to verify. The results analysis shows that the average error rate of travel speed of floating cars at road section on urban expressways and arteries are 13.6% and 27.8%, and the acquisition data and the actual speed have the same distribution. Microwave detector on expressways and loop detectors on arteries are 30% and 56%. Even though the section velocities of the microwave detector have some errors, which could more or less describe the basic driving conditions. Thus, results provide some evidences for selecting appropriate traffic model decided by accuracy. Moreover, it provides evidences for the application of different dimensions information in multi-source data fusion for higher accuracy.