Två studier av kostnader för upphandlade asfaltbeläggningar

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This report presents the results of two studies that analyze the costs of the Swedish Transport Administration’s (Trafikverket) tendered contracts for road pavements. Trafikverket provided two different sources of information about the pavement orders/contracts. The first is VUH database containing more than 20 000 registered and completed orders from the years 2001 to 2011. The second is a compilation of 285 contracts for replacement pavements, i.e. reinvestment in the form of new pavement on longer stretches of road, tendered in 2012 and 2013. The first study analyzes a subset of observations from the VUH database for the most frequent combinations of type and variety separately and for all observations. The results show that the price of bitumen has a strong impact on the cost of pavements: An increase in bitumen price by 10 percent, increases the price of pavements between 1.2 and 3.7 percent. There is some evidence of economies of scale in operations. The cost of pavements, thus increases by between 7 and 10 percent when the size of orders (in tons) increase by 10 percent. Competition measured as the number of active operators in the region during the year, has no significant effect. With some variation, the region of Skåne has lower and the region North region higher costs than other regions. The second demonstrates that cost increase by nearly six percent if the size (in square meters) of a contract increases by 10 percent. There are thus economies of scale to increase in size measured as area. The size of a contract may also be measured as the number of orders in each contract. The analysis indicates that the cost increases with the number of orders. That means that even though there may be economies of scale associated with the procurement of replacement pavements that are large as measured by the pavement are, there may still be reasons not to combine too many orders in one contract. One explanation may be that the distance between the component parts of the overall contract is too long.

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