[5] Downtown Express buses along the corridor have separate stops from streetcars to avoid passenger and vehicle congestion.

[6] Prior to the pilot project, the two curb lanes along King Street were used for rush-hour traffic and for parking in the off-hours.

After the creation of the corridor, space in the curb lanes was converted for other uses such as seating, patios and bicycle parking in order to make the street more pedestrian-friendly.

In 2018, three dozen streetscape improvements were made including eighteen patios, two parkettes and a number of spaces for artists and public displays.

One space by Roy Thomson Hall is decorated by a wall of plastic crates holding planters separating a sitting area from the streetcar lanes.

Along with this change, route 503 was extended west from York Street to Spadina Avenue and turned back at Charlotte Loop.

[9][10] As of January 7, 2019, the 503 route returned to shuttle bus operation to accommodate some construction projects; the 503 terminus was moved back to York Street.

[6][16] On March 23, 2020, all the downtown express bus routes (141–145) were suspended due to reduced ridership during the COVID-19 pandemic,[17] and by late October 2021, they had been delisted from the TTC customer website.

This effort to improve rush-hour streetcar service failed as there was insufficient police enforcement to prevent illegal parking, resulting in motorists continuing to drive on the tracks.

The TTC said that King Street is busy overnight, forcing streetcars to slow down to between 4.6 and 6.8 kilometres per hour (2.9 and 4.2 mph).

Only 1.3% of streetcars took more than 25 minutes to travel between Jarvis and Bathurst Streets during the evening rush hour versus 19% prior to the pilot.

[28][29] The City started a campaign to attract customers to local businesses along the mall, such as a public space design competition, street performers, warming stations and special promotions.

TSP reduced the chances of a streetcar being stopped at a red light, saving an average of 8 seconds per signaled intersection.

City staff wanted more time to collect and analyze data before recommending whether to make the pilot permanent.

[38] From November 2017 to August 2019, police issued 16,000 fines to motorists failing to turn off the corridor where through-traffic is prohibited.

[40] In January 2023, in a 40-minute period during a late weekday afternoon, a Toronto Star reporter observed 31 vehicles disobeying traffic signage at the intersection of King and Yonge Streets.

[41] By the end of November 2023, streetcar performance had deteriorated along the transit corridor mainly due to construction and a lack of police enforcement of traffic rules.

Because of various construction projects, downtown streets were more congested, and motorists were using the transit corridor in violation of traffic restrictions.

A University of Toronto study showed there were 6,800 illegal turns or through movements per day, but less than 0.3 percent of the offending drivers were ticketed.

(Ironically, police ticketed a streetcar driver for failing to clear the York Street intersection and thus blocking southbound traffic.

)[42] On December 8, 2023, Mayor Olivia Chow announced that the city was fixing the problem of illegal traffic along the corridor.

Construction along parallel Adelaide Street would end by late December, providing more room there for road traffic.