Service Description: Maryland highway segment reliability needs measured by the number of hours per year of unreliable roadway operations per mile.
Service ItemId: 4492d4bbb5504aa99b88517c1501f5ae
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Description: MRPT highway segments classified by the number of hours per year during which roadway operations were unreliable over the 2023 assessment year.
Unreliable operations definition: 15-minute NPMRDS travel time samples are grouped by hour-of-day, day-of-week, and month-of-year (for example: 8:00 to 9:00 on Mondays in January 2023). For each group, the 50th and 80th percentile travel times are calculated. If the 80th percentile travel time is at least 1.5 times the 50th percentile, the operational period is classified as unreliable.
Calculation:
- 15-minute travel time samples from NPMRDS are bucketed by hour / day-of-week / month
- Each bucket's 50th and 80th percentile travel times are computed
- Buckets where 80th percentile / 50th percentile is at least 1.5 are flagged as unreliable
- The duration of each unreliable period is summed into a per-segment annual total
- The annual total is normalized to a per-mile rate using segment length
Each segment carries the total annual unreliable hours, the per-mile rate, statewide and county-relative rank labels (Low, Medium, High, Very high) with corresponding 1-7 ranking scores, and a Disadvantaged Community (DAC) overlap flag.
Interpretation: Higher score = greater need.
Source data:
- National Performance Management Research Data Set (NPMRDS), published via the Regional Integrated Transportation Information System (RITIS), 2023
- MRPT roadway network
Part of MDOT SHA's Needs and Opportunities Assessment (NOA) Dashboard.
Copyright Text: Maryland Department of Transportation - State Highway Administration. Travel-time data via NPMRDS / RITIS. Prepared by Renaissance Planning Group.
Spatial Reference: 4326 (4326)
Initial Extent:
XMin: -78.4303884663081
YMin: 36.9954058365033
XMax: -76.0675249975224
YMax: 40.5943509517017
Spatial Reference: 4326 (4326)
Full Extent:
XMin: -79.4871265017919
YMin: 37.9909404178704
XMax: -75.0523992614673
YMax: 39.7230165293866
Spatial Reference: 4326 (4326)
Units: esriDecimalDegrees
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