GTIS Travel Time Report #2
Statistics for Agency:IL-IDOTD8

   Year        Month
Year: 2021 Month: January
Route
Total Length (mi)
  • Total length of all segments for the route listed (may include overlapping segments)
Total Travel Time, GTIS (min)
  • Average total travel time for all segments as reported by the Gateway Traveler Information System (GTIS)
Total Travel Time, NPMRDS (min)
  • Average total travel time for all segments as reported by the National Performance Management Research Data Set (NPMRDS)
Similarity 1 (%)
  • Based on Normalized Root Mean Square Error (NRMSE)
  • Shows how similar the values are / error in measurements
Similarity 2 (%)
  • Based on Mean Absolute Percentage Error (MAPE)
  • Shows how similar the values are / error in measurements
  • Deviation between data points in terms of percentage, effected largely by overforecasts
Abnormality (%)
  • Based on data lying outside of three standard deviations from the mean versus what would normally be expected
  • Affected by GTIS and NPMRDS evenly
Association (%)
  • Based on correlation coefficient between datasets
  • Can you predict one value based on the other
Inequality (%)
  • Based on Theil statistics for the data
  • Suite of four statistics commonly used to compare travel time data
  • Measuring covariance, variance, and bias
Bias (%)
  • Based on Theil bias statistic only
Omission (%)
  • Based on data availability
  • Large amounts of unavailable data results in lower score
Overall (%)
  • Weighted average of the seven intermediate statistics
Change From Last Month(%)
  • Percent change in overall score from previous month
I-25586.4680.4779.6391.2595.4490.5660.3385.3388.7299.9789.17N/A
I-27029.1226.9827.9394.7595.9383.4668.1484.5259.01100.0087.18N/A
I-5566.3659.8158.5491.0893.2688.6468.1778.6564.35100.0086.07N/A
I-6440.0235.8435.7891.1092.0877.3767.1876.6637.98100.0081.71N/A
I-7010.148.768.7893.8297.6492.7858.0379.6393.41100.0090.25N/A
IL-15721.2931.9047.3340.5572.5285.0461.4737.1569.8670.4260.66N/A
IL-15922.8335.9441.3067.3485.9789.3260.5643.4585.2477.6973.95N/A
IL-39.1912.7713.4871.5788.5186.5855.4246.1096.2299.7078.42N/A
Overall285.41292.46312.7882.8291.0287.2263.2971.0873.4194.5282.41N/A
Cells are highlighted red when they decrease by more than -3.21 percentage points which represents the 5th percentile of monthly changes at this aggregation from 2017-2024.

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