He became more generally known for his opposition to the Betuweroute.
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Heertje was a distinct opponent of the construction of the Betuweroute.
Before the construction of the Betuweroute Highspeed Railway, thorough soil research was performed in 1997.
Besides these two existing railway lines, a controversial freight line called the Betuweroute has been operational from 2007.
Adjacent to the four tracks of this line are two tracks for the HSL-Zuid and three for freight, as part of the Betuweroute freight route to Zevenaar.