This development raises questions from local politics, residents, and nature lovers. Therefore, we would like to provide more explanation about the situation regarding this bat species.

Bats and their flight routes along the A2

In 2019, research was conducted on the flight routes of the clipped bat along the A2. At that time, it seemed that the animals crossed the highway via viaducts and portals, meaning that these structures served as safe crossing points. Since these elements would also remain after the widening, it was assumed that no additional wildlife measures were necessary.

New research shows different insights

A repeat of the research in 2023, including the use of thermal imaging cameras, revealed new facts. The bats do fly near viaducts and portals, but do not structurally use them as crossing points. They prefer to fly between trees and tall vegetation along the highway. Due to the widening, many trees must be cut down or will be too far apart, causing the bats to lose their traditional flight routes.

The clipped bat primarily has maternity roosts in Central and South Limburg. It is estimated that up to 40% of the Dutch population crosses the A2, meaning that the population will be significantly affected by the loss of these flight routes.

Development of additional protective measures

As a result of these new insights, additional wildlife measures are necessary. Since 2024, the contractor has been working with domestic and foreign bat experts on suitable solutions to maintain the flight routes. These measures must comply with European legislation and the Environmental Act. Meanwhile, preparatory work such as archaeological research, tree felling, and the relocation of cables and pipelines continues to prevent further delays.

Ministry decision-making and future plans

The additional measures lead to higher costs and a longer construction time. The Ministry of Infrastructure and Water Management is taking the time to make a well-considered decision, which is expected to be announced in the fall. 

Until then, the contractor will continue with preparatory work, including adjusting the underlying road network and transitioning from the current peak lane to a continuous three-lane system with a maximum speed of 90 km/h. This is being done as previously indicated to avoid additional delays in the implementation of the project.

More information on the widening of the A2 Het Vonderen-Kerensheide

For more information about the above work, visit the project page A2: widening Het Vonderen-Kerensheide or contact us.