Distress Identification Manual
Reference
Free
Official 6th Edition LTPP DIM as pavement distress rating guide.
The official mobile companion to the LTPP Distress Identification Manual (DIM) now fully updated to the 6th Edition, published July 2025. Used by pavement raters and reviewers nationwide, the DIM provides a consistent, uniform basis for collecting and reviewing pavement distress data. This 6th Edition incorporates the latest LTPP directives and considerations tied to FHWA's Moving Ahead for Progress in the 21st Century Act (MAP-21).
What's inside:
- Complete distress definitions, descriptions, and illustrations for all three pavement types: asphalt concrete-surfaced, jointed Portland cement concrete (PCC), and continuously reinforced PCC
- Color photographs and reference drawings to help identify and assess distress severity
- Methods for measuring distress size and assigning severity levels
- Guidance on conducting field distress surveys, from traffic control setup to crack measurement
- Sample forms for recording and reporting distress data
- Reference material on fault measurement devices
Whether you're in the field collecting data or in the office performing quality assurance review, the LTPP Distress Identification Manual app gives you the current, authoritative reference in your pocket — no internet connection required once downloaded.
This app was previously called “LTPP InfoPave.” It is now the Distress Identification Manual to better reflect its focus. All distress definitions, descriptions, and illustrations have been updated from the 5th Edition to the latest 6th Edition of the DIM, incorporating the most recent LTPP directives and MAP-21-related refinements.
The developer, iENGINEERING Corporation, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- iENGINEERING Corporation
- Size
- 36.8 MB
- Category
- Reference
- Compatibility
Requires iOS 12.0 or later.
- iPhone
Requires iOS 12.0 or later. - iPad
Requires iPadOS 12.0 or later. - iPod touch
Requires iOS 12.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © Federal Highway Administration, United States Department of Transportation.