Christof quoted Movement by Thalia Verkade
'In the mid-1960s, the Ministry of Transport and Water Management set up its own traffic engineering service. This produced a manual called Motorway Design Guidelines , a Dutch version of the Highway Capacity Manual. Then they came out with the Non-Motorway Design Guidelines, which was based on the first manual. See how it works?'
— Movement by Thalia Verkade (Page 94)
Marcus Popkema from the Windesheim University of Applied Sciences in Zwolle