State Highway Reliability Report - Michigan
The information below summarizes the TPM Highway Reliability performance measures, which include two highway reliability measures and one truck travel time reliability measure. Per 23 CFR 490, State Departments of Transportation (DOTs) are required to establish 2- and 4-year targets for these measures. The targets should represent the anticipated condition/performance at the mid-point and end of the 4-year performance period. State DOTs establish targets at the beginning of each 4-year performance period, and report on progress every two years. When establishing targets, State DOTs have the flexibility to use the methodology they deem most appropriate. FHWA encourages States to review data sets and trends and consider factors that may affect targets. Performance targets should be data-driven, realistic, and attainable and should align with the performance management framework and legislative intent.
The targets and discussion of basis for targets, optional adjustment of targets, progress, and planned activities were provided by the State DOT in its most recent biennial performance report. FHWA has not edited this information. It is provided to help bring context to the State DOT's performance targets and progress. The data in the tables and graphs is from the biennial performance report or HPMS data submittal as noted below each measure summary. Any questions about the information should be directed to the State DOT.
Data reported by State DOTs was collected in the previous year, representing the condition/performance at the time of collection. Thus, in the tables and graphs below, FHWA labels data with the year representing the condition/performance, rather than the year the data was reported. The same thing is done for the targets--the year represents when the corresponding actual condition/performance data will be collected, not reported. More Information.
Significant Progress Determination
FHWA determines significant progress for these measures after the mid-point and end of each performance period. A State has met or made significant progress toward target achievement if “actual” condition/performance is equal to or better than the established two-year target or “actual” condition/performance is better than baseline performance 23 CFR 490.109(e). As provided in 23 CFR 490.107(b)(2)(ii)(A), baseline condition/performance is derived from the latest data collected through the beginning date of the performance period. FHWA will classify the assessment of progress toward the achievement of an individual 2-year or 4-year target as “progress not determined” if a State provides the extenuating circumstance information required in 23 CFR 490.109(e)(5), and FHWA accepts the information.
Most recent Significant Progress Determination for the Reliability measures
Most recent Significant Progress Determination for all applicable measures
Interstate Highway Reliable Person-Miles Traveled
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Interstate Highway Reliable Person-Miles Traveled 2017 2018 2019 2020 2021 Condition/Performance 85.2 87.3 88.6 99.4 -- Target -- -- 75.0 -- 75.0 -
Interstate Highway Reliable Person-Miles Traveled
Conservative targets were established for the 2018 to 2021 performance period. The targets reflect the best information available at the time targets were established due to gaps in probe data and further limited by the NPMRDS data set only having seventeen months of data to evaluate. As the quantity and quality of data improves, the detection of trends should become more observable and distinctive. MDOT is continuing to monitor reliability and will use the mid-performance period as an opportunity to evaluate the targets and adjust course as appropriate.Using 2019 reliability data, Michigan achieved significant progress for the 2-year person-mile reliability target. The mid-point performance outcome of 88.6 percent reliable was an improvement over the 2018 baseline condition of 85.2 percent and outperformed the 2-year target of 75.0 percent. Most of the improvement occurred during the winter months of 2019. January through April and December of 2019 was roughly 5 percent more reliable than 2018. Winter weather which is hard to quantify has a significant impact on reliability in the state of Michigan. April through November saw less than a 1 percent improvement.Due to the pandemic, reliability has greatly improved in the first half of 2020 and is approaching 100 percent. This is an increase of 10-15 percent improvement compared to the previous 2 years. AADT has significantly decreased in 2020.
N/AAt the end of 2018, MDOT created an Operations Template for projects that reduce congestion and improve reliability and safety. One criterion in selecting projects is the Level of Travel Time Reliability which is the key component of determining the segments are reliable. These efforts support Michigan’s Interstate reliability goals. Starting in 2020, approximately $40 million in annual improvements to Michigan’s freeway system have been/will be programmed barring any reductions to MDOTS overall program due to revenue loss. Numerous projects are on the interstate including the I-96 flex route between Brighton and Novi which is one of the most unreliable freeways segments in the state. Data Sources:
Michigan 2018, 2020 Biennial Performance Report
Michigan 2018, 2019, 2020, 2021 HPMS Data Submittal
Non-Interstate National Highway System (NHS) Reliable Person-Miles Traveled
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Non-Interstate NHS reliable Person-Miles Traveled 2017 2018 2019 2020 2021 Condition/Performance -- -- 88.5 94.5 -- Target -- -- -- -- 70.0 Behind the data: For the first performance period only, baseline condition and 2-year targets are not required for the Non-Interstate NHS reliability measure.
Non-Interstate National Highway System (NHS) Reliable Person-Miles Traveled
Conservative targets were established for the 2018 to 2021 performance period. The targets reflect the best information available at the time targets were established due to gaps in probe data and further limited by the NPMRDS data set only having seventeen months of data to evaluate. As the quantity and quality of data improves, the detection of trends should become more observable and distinctive. MDOT is continuing to monitor reliability and will use the mid-performance period as an opportunity to evaluate the targets and adjust course as appropriate.N/AN/AN/AData Sources:
Michigan 2018, 2020 Biennial Performance Report
Michigan 2020, 2021 HPMS Data Submittal
Interstate Highway Truck Travel Time Reliability (TTTR) Index
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Truck Travel Time Reliability Index 2017 2018 2019 2020 2021 Condition/Performance 1.38 1.40 1.44 1.24 -- Target -- -- 1.75 -- 1.75 -
Interstate Highway Truck Travel Time Reliability
Conservative targets were established for the 2018 to 2021 performance period. The targets reflect the best information available at the time targets were established due to gaps in probe data and further limited by the NPMRDS data set only having seventeen months of data to evaluate. As the quantity and quality of data improves, the detection of trends should become more observable and distinctive. MDOT is continuing to monitor reliability and will use the mid-performance period as an opportunity to evaluate the targets and adjust course as appropriate.Using reliability data, Michigan achieved significant progress for the 2-year truck travel time reliability index target. The mid-point performance outcome of 1.44 was an expected decline from the 2018 baseline condition of 1.38 but outperformed the 2-year target of 1.75. CADT increased 4 percent between 2018 and 2019.N/AAt the end of 2018, MDOT created an Operations Template for projects that reduce congestion and improve reliability and safety. One criterion in selecting projects is the Level of Travel Time Reliability which is the key component of determining the segments are reliable. These efforts support our goals for reliability on the Interstate. Starting in 2020, approximately $40 million in annual improvements to Michigan’s freeway system have been/will be programmed barring any reductions to MDOTS overall program due to revenue loss. Numerous projects are on the interstate including the I-96 flex route between Brighton and Novi which is one of the most unreliable freeways segments in the state. Data Sources:
Michigan 2018, 2020 Biennial Performance Report
Michigan 2018, 2019, 2020, 2021 HPMS Data Submittal
Significant Progress Determination
This table shows FHWA’s most recent determination for the Infrastructure performance measures.
PLEASE NOTE: Each State’s performance target assessment is based on its own State-specific target methodology and program philosophy. Therefore, conclusions should not be drawn based only on the information in the Significant Progress Determination Results table. FHWA understands that each State’s program is unique and therefore does not prescribe a methodology for States to set targets. States have the flexibility to use the methodology they deem most appropriate when setting their performance targets.
| Measure Area | Measures | Baseline | Target | Actual | Better than Baseline? | Achieved Target? | Made Significant Progress? | Consequences [23 CFR 490.109(f)] | |
|---|---|---|---|---|---|---|---|---|---|
| The performance of the Interstate System | Interstate Travel Time Reliability measure | 85.2 | 75 | 88.6 | Yes | Yes | Yes | None | |
| Freight movement on the Interstate System | Freight Reliability measure | 1.38 | 1.75 | 1.44 | No | Yes | Yes | None | |