On a narrow rural road you pass a sign showing a car overtaking a bicycle inside a red ring. A cyclist is riding ahead of you and there is oncoming traffic only occasionally. What does the sign require, and how will you know when it stops applying?

Correct answer: A. Do not overtake the cyclist until you reach the same sign carrying an ENDS tab

Stay behind the cyclist until you see the same sign again with an ENDS tab under it. Book 5 says the DO NOT PASS BICYCLES sign "indicates to drivers that they must not overtake a cyclist within a specified zone", and that "the passing prohibition takes effect at the point where the DO NOT PASS BICYCLES sign is located", with the ENDS tab marking the termination. Repeat signs appear every 300 to 1,000 metres along the route, so a stretch of road without one does not mean the zone has finished. These zones are posted where overtaking a cyclist is genuinely hazardous — construction areas, no-passing zones where drivers have been ignoring the pavement markings, and places where the road narrows enough that squeezing past risks a head-on or a sideswipe.

Source: MTO Driver's Handbook: Ontario Traffic Manual, Book 5 — Regulatory Signs (December 2021), Section 5 — DO NOT PASS BICYCLES Sign (Rb-66) and ENDS Tab Sign (M204)