This study focused on the correlation between the primary and the secondary impacts of a road development. Its methodology is aimed at coupling the conventional cost benefit analysis with an economic impact analysis. The secondary impacts of road development concentrated on the changes in land values. These changes were modelled using a new model; which related the percentage change in land values with four variables: the distance from the road; the land use; the land area; and the time that has elapsed since the completion of the roadworks. For a period of 30 years, a comparison was carried out to examine the similarities in the trends of the road users' benefits and the CLVs. Three main periods were found through this comparison. The first period is from year 0 to year 3; the second period is from year 4 after the road's opening to year 19; the last period starts from year 20 and finishes at the end of the analysis. The primary and secondary impacts in the first and the third periods of analysis behaved inversely; while the rest of the analysis period showed similar behaviour for the CLV and the RUCS. It was found that the factors affecting the degree of their similarity were traffic volume and the response of the network users to the new road. In addition, the limitation of the developed model of CLVs in terms of the variables used and particularly in their maximum and minimum values also affects the degree of similarity.