Dozens turned out to see the first four stops of the dedicated east-west corridor, which officially opens to the public on Monday.
Officials hope it will make commuting both faster and more reliable. Some stations include Wi-Fi access and heated floors to make waiting for the bus more comfortable.
"The buses will be able to travel without any congestion, any traffic and any traffic lights," said MiWay director of transit Geoff Marinoff.
"And just in this short stretch the bus will be able to bypass 10 traffic lights, so you can imagine what's that's going to do for your daily commute."
MiWay will eventually comprise 12 stops over 18 kilometres, plus a connection to the TTC's Kipling subway station.
Completion is slated for 2019. The first four stops, which officially open on Monday, mark Phase 1 of the project.
Phase 1 is expected to shave three to six minutes off a rider's commute time, with the whole system saving between 10 and 15 minutes.
"We expect two million passengers in the first year and, once the entire corridor is open, we expect five million passengers a year," Marinoff said.