Right. So. Limiting ourselves to Europe (as opposed to specifically the Netherlands), here's the Road Block list:
S1 - Eiffel Tower, Sewers, SmartCar
S2 - none
S3 - Highland Games, Penalty Kick, Rescue Cable, William Tell, Bicycle Assembly
S4 - Masquerade Ball, Bungy, Le Mans, Eels
S5 - Caviar
S6 - Zipline, Haybales, Soapbox Derby, Reverse Bungy, Soup, Wine Stomp
S7 - Fortress (which took place in the European part of Istanbul), Bus Driving
S8 - none
S9 - Diving, Gnomes, Statue Puzzle, Kayak Polo, Bungy
S10 - Limestone Mine, Tank, Skydive
S11 - Knight
S12 - Highwire Bike, Fierljeppen, Messenger, Brick Wall, Ultralight
S13 - Flour, Statue Count
S14 - Bungy, Paraglide, Gymnastics, Toboggan, Underpants Jog
S15 - Bells, [Haybales], Candelabra, Mandolin, Franz
S16 - Bungy, Abseil
S17 - Trebuchet, Dogsled, Abseil
S18 - Chimney, Liechtenstein, Chocolate
S19 - Renaissance Dancing, Bicycle/Quote, Test Drive
S20 - Abseil, Curling
Take out everything you couldn't replicate in the Netherlands, and that would make absolutely no sense to copy:
S1 - SmartCar
S3 - Penalty Kick, Bicycle Assembly
S4 - Eels
S6 - Haybales
S7 - Bus Driving
S10 - Tank, Skydive
S11 - Knight
S12 - Fierljeppen, Messenger, Ultralight
S13 - Flour
S15 - Bells
S17 - Trebuchet
S19 - Renaissance Dancing, Bicycle/Quote, Test Drive
Now take out anything that couldn't be considered either "infamous" or "hilarious" after its first appearance, even if it was Dutch:
S6 - Haybales
S7 - Bus Driving
S11 - Knight
S17 - Trebuchet
The haybales have been a Switchback before, so we can rule it. Though it's the obvious choice I doubt CBS would risk letting them to the trebuchet task again, so we're down to two. Neither the bus driving nor the knight Road Block are infamous enough to justify being called "infamous", so my only possible conclusion is that either it's not in the Netherlands, OR it's not a Road Block they're copying. Certainly wouldn't be the first time CBS has made mistakes with their publicity.