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Description:
MDOT SHA Pavement Condition NHS data consists of linear geometric features which represent roadway pavement conditions along the National Highway System (NHS) throughout the State of Maryland. This data product includes the national transportation performance measure infrastructure conditions, specifically the Good, Fair, & Poor condition ratings which are based on roughness, cracking and rutting/faulting, depending on surface type.
The performance measure for pavements shall be based on three condition ratings of Good, Fair, and Poor calculated for each pavement section, as described in Detailed in “National Performance Management Measures for Assessing Pavement Condition,” 23 CFR 490 Subpart C (Code of Federal Regulations).
The Ratings are determined as follows:
(1) International Roughness Index (IRI) Rating shall be determined for all pavement types using the following criteria. If an IRI value of a pavement section is: -
- Less than 95, the IRI rating for the pavement section is Good;
- Between 95 and 170, the IRI rating for the pavement section is Fair; and
- Greater than 170, the IRI rating for the pavement section is Poor.
(2) Cracking Condition shall be determined using the following criteria:
(i) For asphalt pavement sections -
- If the Cracking_Percent value of a section is less than 5 percent, the cracking rating for the pavement section is Good;
- If the Cracking_Percent value of a section is equal to or greater than 5 percent and less than or equal to 20 percent the cracking rating for the pavement section is Fair; and
- If the Cracking_Percent value of a section is greater than 20 percent the cracking rating for the pavement section is Poor.
(ii) For jointed concrete pavement sections -
- If the Cracking_Percent value of a section is less than 5 percent, the cracking rating for the pavement section is Good;
- If the Cracking_Percent value of a section is equal to or greater than 5 percent and less than or equal to 15 percent the cracking rating for the pavement section is Fair; and
- If the Cracking_Percent value of a section is greater than 15 percent the cracking rating for the pavement section is Poor.
(iii) For CRCP sections:
- If the Cracking_Percent value of a section is less than 5 percent, the cracking rating for the pavement section is Good;
- If the Cracking_Percent value of a section is equal to or greater than 5 percent and less than or equal to 10 percent, the cracking rating for the pavement section is Fair; and
- If the Cracking_Percent value of a section is greater than 10 percent, the cracking rating for the pavement section is Poor.
(3) Rutting or Faulting Rating shall be determined using the following criteria.
(i) For asphalt pavement:
- If the rutting value of a section is less than 0.20 inches, the rutting rating for the pavement section is Good;
- If the rutting value of a section is equal to or greater than 0.20 inches and less than or equal to 0.40 inches, the rutting rating for the pavement section is Fair; and
- If the rutting value of a section in is greater than 0.40 inches, the rutting rating for the pavement section is Poor.
(ii) For jointed concrete pavement:
- If the faulting value of a section is less than 0.10 inches, the faulting rating for the pavement section is Good;
- If the faulting value of a section is equal to or greater than 0.10 inches and less than or equal to 0.15 inches, the faulting rating for the pavement section is Fair; and If the faulting value of a section is greater than 0.15 inches, the faulting rating for the pavement section is Poor.
- The overall pavement condition to calculate good/poor metrics combines consideration of IRI, cracking and rutting/faulting, depending on surface type.
The Overall Pavement Condition is calculated as:
Good
- For asphalt and jointed concrete pavements if all three metrics (IRI, cracking, and rutting/faulting) are good.
- For continuous concrete pavements if both IRI and cracking are good.
Poor
- For asphalt and jointed concrete pavements if at least two metrics (IRI, cracking, and rutting/faulting) are poor.
- For continuous concrete pavements if both IRI and cracking are poor.
Fair
- For all other combinations
MDOT SHA Pavement Condition NHS data is owned & maintained by the MDOT SHA Office of Materials Technology (OMT). This data product is consistently updated on an annual basis for the prior year. This data product is for the year 2020.
Last Updated: March 2022
For additional information, contact the MDOT SHA OIT Enterprise Information Services:
Email: GIS@mdot.maryland.gov
Copyright Text: Maryland Department of Transportation (MDOT), Maryland Department of Transportation State Highway Administration (MDOT SHA), MDOT SHA Office of Materials Technology (OMT), MDOT SHA Pavement & Geotechnical Division (PAGD), MDOT SHA OIT Enterprise Information Services (GIS@mdot.maryland.gov)
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