Explanation for accessibility via the main highway network 2000-2007

In this study by KiM Netherlands Institute for Transport Policy Analysis empirical research is used to explain increases in traffic congestion levels.

From 2000 to 2007, the hours of delay encountered while travelling on the main highway network increased by 50%. Population growth, rising employment levels and increased rates of car ownership are primarily responsible for this sharp increase. Moreover, implementation of the 2004 Tax Plan and speed-limit restrictions, combined with route controls, also contributed to the increase in hours of travel delay. Without the construction of new roads, extra lanes and traffic management systems, the hours of delay would have increased by an additional 13%.

The increase in travel delays is higher than had previously been anticipated in the transport policy. This is partly due to the fact that many measures were postponed or rejected, and partly because other factors accounted for more hours of delay than was previously expected.