Detail of accessibility analysis by road for Freiburg, Germany

Data preparation for accessibility calculation
• Building road network in ArcGIS
• Assigning attributes by road type
                                Road type Speed (km/h)
                                 Motorway 120
                                 Primary Route 100
                                 Secondary Route 80
                                 Local Road 50
• Selection of urban agglomerations > 50 000 inhabit

Creation of a service area analysis layer at country level from the road network with the following analysis parameters:
• Impedance (Cost attribute in minutes).
• Default Breaks (15, 30, 45, 60 minutes).
• Generate polygons.
• Dissolve polygons by service area
• Aggregation of all the accessibility polygons by country