The German standard for systematic visual condition assessment of municipal and urban road surfaces.

The FGSV E EMI methodology requires each inspection to begin with a clearly defined road segment (Abschnitt). A segment is a contiguous section of municipal road that shares common construction characteristics, pavement type, and functional classification. The Segment ID (Abschnitts-ID) uniquely identifies each inspection unit within the municipal road network database. This identifier links the visual condition data to the broader asset management system, enabling historical trend analysis across inspection cycles. The Pavement Type (Befestigungsart) field is a critical classification that determines which distress types are applicable. The standard recognizes six distinct surface categories: Asphalt, Concrete (Beton), Paving Stones (Pflaster), Flagstones (Plattenbelag), Unbound (Ungebunden), and Semi-bound (Halbstarre Deckschicht). Each surface type has different expected distress patterns and deterioration mechanisms.

The Segment Area (Bezugsflaeche) is recorded in square meters and serves as the denominator for all damage density calculations. Without an accurate area measurement, the Zustandsnote calculation produces unreliable results. For narrow residential streets, the segment area may be as small as 200 square meters, while main arterial roads may define segments of 2,000 square meters or more. The Functional Class (Strassenkategorie) provides context for interpreting the condition rating. A Main Road (Hauptverkehrsstrasse) carrying heavy traffic has different maintenance thresholds than a Residential Street (Anliegerstrasse) or Pedestrian Zone (Fussgaengerzone). German municipalities use the functional class to apply differentiated warning and threshold values when translating condition grades into maintenance budgets. In the digital form, these four fields establish the baseline for every segment inspection.

For a comparable pavement assessment methodology used internationally, see the ASTM D6433 PCI standard.

The damage catalog defined in AP 9 K 2.3 is the core reference for E EMI field inspections. It organizes pavement distresses into five Distress Groups (Merkmalsgruppen): Cracks (Risse), Surface Defects (Oberflaechenschaeden), Deformation (Verformungen), Patches (Flickstellen), and Edge Defects (Randeinfassungen). Each group contains between two and four specific Distress Types (Schadensarten) that the inspector selects during the survey. The Cracks group distinguishes between Single Cracks (Einzelrisse), Network or Alligator Cracks (Netzrisse), Seam and Joint Cracks (Naht-/Fugenrisse), and Reflection Cracks (Reflexionsrisse). This differentiation matters because each crack pattern indicates a different failure mechanism. Single cracks often result from thermal contraction, while network cracks signal structural fatigue at the base layer. Reflection cracks propagate upward from joints in an underlying concrete layer.

Surface Defects include Potholes (Schlagloecher), Raveling (Ausmagerung), Bleeding (Bindemittelanreicherung), and Edge Break (Kantenabbruch). The Deformation group captures Rutting (Spurrinnen), Depressions or Settlement (Setzungen/Mulden), and Corrugation (Waschbrettbildung). Patches are classified as Asphalt Patches (Flickstelle Asphalt), Paving Patches (Flickstelle Pflaster), or Utility Cuts (Aufgrabung). Finally, Edge Defects record Curb Damage (Bordsteinschaeden) and Gutter Damage (Rinnsteinschaeden). Each distress type has a designated measurement unit. Linear distresses such as single cracks and curb damage are measured in meters (m). Area-based distresses like network cracks, raveling, and patches are measured in square meters (m2). Point features like potholes may be counted individually (Anzahl n) or measured as a percentage of affected area (%). The inspector selects the appropriate unit from the form to ensure consistent damage density calculations.

The FGSV E EMI standard uses a three-level severity system (Schweregrad) for classifying the condition of each recorded distress. Light severity (Leicht / S1) indicates early-stage deterioration that does not yet affect driving comfort or structural performance. A hairline crack less than 2 mm wide or minor aggregate loss on the surface are typical S1 conditions. Medium severity (Mittel / S2) represents progressed deterioration that noticeably affects the road surface. Cracks wider than 2 mm with secondary branching, potholes deeper than 20 mm, or rutting visible to the naked eye fall into this category. Heavy severity (Schwer / S3) signals advanced structural failure that poses safety risks or requires urgent intervention. Cracks wider than 10 mm with spalling edges, deep potholes exceeding 50 mm, or large-area network cracking with loose fragments are classified as S3.

The severity classification directly influences the weighting applied during Zustandsnote calculation. A heavy-severity distress contributes disproportionately more to the condition grade than the same quantity of light-severity damage. This nonlinear weighting reflects the engineering reality that severe distresses accelerate deterioration through water infiltration and load concentration. The Extent/Quantity (Ausmass) field records the measured size or count of each distress entry. Combined with the Segment Area, this value produces the damage density (Schadensdichte) that forms the basis of the condition calculation. Inspectors are required to use consistent measurement techniques within each survey cycle to ensure that year-over-year comparisons remain valid. Photo documentation, while optional, is strongly recommended for S2 and S3 distresses to support later verification and maintenance planning decisions.

The FGSV E EMI 2012 produces a Zustandsnote (condition grade) on a scale from 1.0 to 5.0, in steps of 0.5. This grading system is the standard reporting format for all German municipal road condition assessments and is color-coded in official outputs. A grade of 1.0 represents Very Good (Sehr gut) condition, indicating a road surface that meets target specifications with no visible deterioration. Grades 1.5 through 2.4 indicate Good (Gut) condition requiring only routine monitoring. Satisfactory (Befriedigend) grades from 2.5 to 3.4 trigger intensive monitoring and minor repair planning. The critical transition occurs at grade 3.5, which is the Warning Value (Warnwert). This threshold signals that planning of maintenance measures is required and the road section should be placed on the rehabilitation priority list. Grades from 4.5 to 5.0 represent the Threshold Value (Schwellenwert), indicating Poor or Inadequate condition that demands immediate intervention or potential road closure.

The standard explicitly separates the assessment into two dimensions: Structural Value (Substanzwert) reflecting the long-term durability of the pavement structure, and Usage Value (Gebrauchswert) reflecting driving comfort and safety. The Overall Condition Rating (Gesamtnote Visuell) in the form captures the inspector's holistic assessment that considers both dimensions. The Global Parameters section adds General Unevenness (Allgemeine Unebenheit) on a 1-to-5 scale and an optional Grip/Skid Resistance (Griffigkeit) assessment. These global parameters validate the calculated Zustandsnote and can flag discrepancies between the sum of individual distresses and the overall segment condition.

What makes the FGSV E EMI methodology distinct from subjective road rating systems is its reliance on quantified damage density (Schadensdichte). Rather than asking an inspector to assign a general condition impression, E EMI requires measured distress quantities that are mathematically normalized against the segment area. The damage density for each distress entry is calculated by dividing the measured Extent/Quantity by the Segment Area. For example, if an inspector records 15 square meters of network cracking (Netzrisse) in a segment with a 500 square meter reference area, the damage density for that entry is 3%. Each damage density value is then transformed into a dimensionless Zustandswert (condition value) using transfer functions defined in the standard. These transfer functions are nonlinear: a small increase in damage density near the warning threshold produces a disproportionately larger increase in the condition value than the same increase at low density levels.

The individual condition values for all recorded distresses are aggregated through a weighted combination that accounts for severity levels. S3 (Heavy) distresses receive the highest weighting factor, reflecting their outsized impact on structural integrity and road safety. The aggregated values are separated into Substanzwert (structural value) components like cracks and deformation, and Gebrauchswert (usage value) components like unevenness and skid resistance. The final Zustandsnote is the worse (higher) of the two sub-values, ensuring that a road with excellent structural integrity but poor driving comfort — or vice versa — still receives an appropriately low grade. This dual-axis approach prevents a road that is structurally sound but dangerously uneven from receiving a passing grade. German municipalities typically run E EMI assessments on a 4-to-6-year cycle, allowing trend analysis of damage density progression that feeds directly into multi-year maintenance budgeting.

The complete damage catalog and transfer functions are published by the FGSV Verlag published. For an overview of modern automated condition assessment approaches in Germany, see vialytics municipal road scanning.