Warning signs
Traffic joins from another road ahead; adjust speed and spacing to let it blend in.
Check your mirrors and be ready to adjust your speed or position so joining traffic can blend in safely.
The shape is almost always a yellow diamond with a black border and a black symbol or arrow. The one exception in this set is the railway advance sign, which is a yellow circle with a black X, kept round on purpose so it stands out from the diamonds around it well before you reach the tracks.
A warning sign tells you about a hazard or an unusual condition ahead so you can adjust your speed and attention before you reach it. It is advice rather than a command with its own penalty, though ignoring it can put you in a position where another rule then applies.
15 questions in our banks show this sign and ask what it requires. Here are 6, each with the answer marked and the authority it rests on.
This sign is posted on the road you are driving along. What is about to happen?
Traffic from another road is about to join yours
The sign is about drivers arriving from a road that joins yours, and they have to fit into gaps in your traffic. Adjusting your speed, or moving over a lane where it is safe to, costs you nothing and gives them the room they need.
Highway Traffic Act (Ontario)This sign is posted on the road you are travelling. What is happening ahead?
Traffic will be joining your road from another road
A merge sign warns that vehicles are about to enter the road you are already on, usually from a ramp. Your job is to adjust your speed or move over where it is safe, because the joining driver has a short lane and much less room to work with than you do.
Motor Vehicle Act (British Columbia)This sign is at the side of the road you are driving on. What is about to happen?
Traffic from another road will join the one you are on
The sign warns the traffic already on the road that vehicles are about to blend in from another one, often from a ramp with a short lane to do it in. Your job is to make that easy: adjust your speed and spacing, or move over if the next lane is clear. The joining driver has far less room to solve the problem than you do.
Alberta Driver's Guide (Government of Alberta)This sign faces you on the main road, and a ramp is climbing toward you on the right with traffic on it trying to join. What is the right handling?
Adjust your speed or move over so a gap opens for them, if you can do it safely
Merging works when both drivers give a little: the joining driver looks for a gap and the through driver makes one available. Braking hard for a merge is nearly as bad as ignoring it, because the driver behind you did not see what you saw. A small lift or an early lane change costs you almost nothing.
Highway Safety Code (Quebec)You are in the right lane of a highway and this sign warns of traffic joining from a ramp ahead. What is the most helpful thing you can do?
Move to the left lane if it is clear, or adjust your speed to open a gap
The joining driver has to give way, but merging only works when the through traffic leaves somewhere to go. Sharp braking and a late burst of speed both remove the gap the other driver was aiming for, and the vehicle behind you is left guessing what you are doing.
Highway Traffic Act (Ontario)This sign is posted and a car on the ramp beside you is running out of lane. What is the best thing to do?
Adjust your speed, or move left if the lane is clear, so a gap opens for them
Merging works when both drivers give a little rather than one making a sudden move. Hard braking in a live lane puts the vehicle behind you at risk, and moving over is the cleaner answer whenever there is space to do it safely.
Motor Vehicle Act (British Columbia)The other 9 sit in the signs drills, which ask sign questions on their own with the reason for every answer.
Counted from the questions written for each province when the site is built, not typed by hand.
4 questions: 2 on the G1 knowledge test, 1 on the M1 knowledge test, 1 on the Class A knowledge test
4 questions: 2 on the ICBC knowledge test, 1 on the Motorcycle knowledge test, 1 on the Class 1 knowledge test
5 questions: 2 on the Class 7 knowledge test, 1 on the Class 6 knowledge test, 1 on the Commercial knowledge test, 1 on the Class 4 knowledge test
2 questions: 1 on the SAAQ knowledge test, 1 on the Class 1 knowledge test
Signs that share this one's shape and colour rule, and are easy to confuse with it under a clock.
One of the lanes ahead ends; traffic in it must merge into the lane that continues.
The bridge or underpass ahead is narrower than the road; approach with care.
The road ahead is slippery when wet; slow down and avoid sudden moves.
A bump or uneven surface is ahead; slow down.
A steep downgrade is ahead; slow down and be ready to gear down.
The road ahead divides around a median; keep to the right side.
Traffic joins from another road ahead; adjust speed and spacing to let it blend in. Check your mirrors and be ready to adjust your speed or position so joining traffic can blend in safely.
It is a warning sign. A warning sign tells you about a hazard or an unusual condition ahead so you can adjust your speed and attention before you reach it. It is advice rather than a command with its own penalty, though ignoring it can put you in a position where another rule then applies.
It appears in the Ontario, British Columbia, Alberta and Quebec practice banks on this site: 4 in Ontario, 4 in British Columbia, 5 in Alberta, 2 in Quebec. Every question is original prose citing Highway Traffic Act (Ontario), Motor Vehicle Act (British Columbia), Alberta Driver's Guide (Government of Alberta) and Highway Safety Code (Quebec).
The meaning and the action are the standard ones taught across Canada. Each question above cites the law or the guide it rests on, and the exam facts on the province pages come from the records below.
Ontario Ministry of Transportation, G1 licensing rules and DriveTest fee schedule
Verified 2026-08-27
DriveTest, Knowledge Tests (Serco Canada Inc., the ministry appointed driver examination provider)
Verified 2026-08-28
Fees read from the DriveTest fee list on the same date.
DriveTest, Commercial Vehicles licence requirements
Verified 2026-08-28
Fees read from the DriveTest fee list on the same date.
ICBC published graduated licensing and knowledge test information
Verified 2026-08-27
ICBC, Before you take your knowledge test (form MV2654)
Verified 2026-08-28
Fees read from the ICBC fee list on the same date.
Government of Alberta published Class 7 licensing and knowledge test information
Verified 2026-08-27
Government of Alberta, Get a Class 6 motorcycle driver licence
Verified 2026-08-28
Question count and pass mark read from the Alberta driver knowledge test page on the same date.
Government of Alberta, Driver knowledge test
Verified 2026-08-28
Government of Alberta, Obtaining a commercial licence
Verified 2026-08-28
Question count and pass mark read from the Alberta driver knowledge test page on the same date, and the ride for hire rule from the Alberta ride for hire services page.
SAAQ published licensing, driving course and knowledge test information
Verified 2026-08-27
SAAQ, Heavy Vehicle Driver's Licence (Class 1)
Verified 2026-08-28
Read through an Internet Archive copy of the SAAQ page captured on 2026-08-13, because the SAAQ turns away visitors from outside Canada. The French page is cited because it is the version the SAAQ updates first.