Yes.

This week for Torontoist, I answered this question for Ask Torontoist, a column where site staff answer readers' questions.

In Ontario, construction workers can direct one lane of traffic in the same direction if they have the required training; are competent; have the proper safety equipment; and are not preforming another task while directing vehicular traffic. Police officers are only required when traffic signals are disrupted; when pedestrians and vehicles cross the same space; or when someone has to direct multiple lanes of traffic, or traffic in different directions.

Photo by Dom Cruz.