A hydro utility truck comes up behind you sounding a siren, with a lamp producing intermittent flashes of red light. It is not police, fire or an ambulance. Do you have to pull over and stop?

Correct answer: D. Yes — a public utility emergency vehicle with a siren and flashing red light triggers the same duty to pull over and stop

Yes. HTA s.159(1) places the same duty on you "upon the approach of a public utility emergency vehicle with its bell or siren sounding or its lamp producing intermittent flashes of red light" as it does for an ambulance, fire truck or police car. You must immediately bring your vehicle to a standstill as near as practicable to the right-hand curb or edge of the roadway, parallel to it and clear of any intersection. The one detail that differs is the colour: the Act allows police, fire, ambulance and ministry enforcement vehicles red *or* red-and-blue flashes, while a public utility emergency vehicle is described with red only. What matters from the driver's seat is the flashing red light and the siren, not the badge on the door.

Source: MTO Driver's Handbook: HTA Section 159(1) — pulling over for a public utility emergency vehicle