"The straightest highway in Saskatchewan is Highway 33, which is 139 kilometers (86 miles) long and runs southeast towards Stoughton. It's the longest straight road in Canada and the 12th longest in the world. Some say the highway is so flat that it's part of an experiment to prove the Earth is round."
This is a bit of a lie as there is a slight curve near Richardson and another at Lajord but it is definitely a tie your seatbelt to the steering wheel and have a nap kinda road.