Travel Time Reliability Reference Manual/NPMRDS and INRIX Data Comparison

=Comparison of INRIX and NPMRDS Data Sets=

A comparison of speed data between INRIX and NPMRDS for January 2012 on a 4-lane inter-regional and 6-lane urban freeway.

Particularly on the urban freeway, the NPMRDS data reports lower speeds than INRIX with higher variability. The matched pair graphs below reveal a similar trend represented by the linear fit with the intercept set to zero.



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