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Table 1 Freight data used for the study

From: Characterization and analysis of metropolitan freight patterns in Medellin, Colombia

Data collection Observations Variables
Cordon survey 2950 commercial vehicles Origin and destination of the trip
Commodities being transported
Commercial vehicle being used
Establishment survey 2947 establishments Vehicle delivery/collection trips at establishments
Goods flows to/from establishments
Loading/unloading activity of goods vehicles
Parking activity of trucks
Carrier interview 10 companies and 130 truck drivers Trip details and patterns of goods vehicles
Conveyance of goods between vehicles and establishments
Supply chain management between establishments, their suppliers and freight transport operators