Abstract: Recognizing public transportations vital role in citizens lives, assess-ing user satisfaction is crucial. Literature highlights a link betweenspatial and operational design of transport lines. This study intro-duces a method to assess whether differences in quality perceptionexist when grouping lines by these similarities. Based on a surveyof Valladolids public bus system, including 38 quality indicatorsand socioeconomic profiles, initial analysis identified four route pat-terns: transversal, longitudinal, circular, and undefined. Using princi-pal component analysis (PCA) and confirmatory factor analysis (CFA),five latent variables (timetables, user information, on-board facilities,services, and comfort) were constructed and analyzed using a gen-eralised partial credit model (GPCM). This revealed spatial disparities:longitudinal routes excelled in punctuality and service, while infor-mation availability was rated consistently. Recommendations aimto enhance frequency, accessibility, and comfort on specific routes,addressing inequalities in service perception.

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