Drivers who use a single-lane section of highway between Fort Qu'Appelle and Balgonie may find it smoother and safer from now on.
Four sets of passing lanes are now open on Highway 10.
Passing lanes allow slower vehicles to stay in a temporary right lane and allow faster vehicles to pass.
It means people who want to pass, don't have to cross over the yellow line.
Adding passing lanes is cheaper than doubling lanes for the entire length of the highway.
In addition, 30 kilometres of the stretch has been repaved.
The cost to the province was about $16 million.