Ontario G1 test

0 of 128 lessons complete (0%)

MODULE 12: Driving at night and in bad weather

Lesson 3 with Quiz : Fog

To ensure your safety, you need to be aware of the unique dangers that fog poses. 

Mist reduces visibility and can create dangerous driving conditions. 

Module 12: Quiz 3


1 / 5

When driving in fog, your following distance should be…?

2 / 5

The best way of avoiding accidents in fog is…?

3 / 5

Driving in fog, you should pass other vehicles and change lanes…?

4 / 5

If you have to drive in fog, it is best to…?

5 / 5

When driving in fog you should use fog lights and…?

Your score is

The average score is 0%


Understanding Fog and Its Characteristics

The fog is caused by tiny water drops or ice crystals floating in the air. When moist air rapidly cools, it causes condensation. There is a reduction in visibility in a variety of ways, from a fine mist to obstructive conditions. Drivers need to understand the characteristics of fog.

Types of Fog

Depending on the conditions, different types of fog may occur. When warm, moist air is blown over a cooler surface, advection mist occurs. Radiation mist appears on clear nights when heat from the earth’s surface is lost through radiation. Upslope fog is another type, as are evaporation and freezing mist. Each has its own characteristics, which can affect driving.

Impact on Driving

Driving conditions are significantly affected by mist, which reduces visibility and changes the dynamic of the road. It is important to understand how mist affects driving in order to take the necessary precautions.

Reduced Visibility

Mist can have a significant impact on visibility. It can make it difficult for drivers to navigate and see road signs and objects.

Altered Perception of Distance and Speed

The fog can affect a driver’s ability to judge distance and speed. It can make objects appear much closer than they are. Also, it is difficult to judge the speed of another vehicle. Drivers must adjust their driving style to compensate for this distortion.

Increased Stopping Distances

Fog reduces visibility, requiring longer stopping distances. It is important to keep a safe distance behind the vehicle, as drivers may only have a limited amount of time to react when there are sudden changes or obstacles.

Essential Tips for Driving in Mist

Driving through fog is a mixture of preparedness, caution and adhering to certain driving techniques. These tips will help you stay safe in misty weather.

Use Low-Beam Headlights

Low-beam headlights are the best choice for driving through fog. They provide enough illumination without creating any glares or reflecting off of mist drops. The high-beam headlights will reflect the light, further decreasing visibility.

Activate Fog Lights if Available

Fog lights are available on many vehicles to help cut through thick fog. They also improve visibility. Use mist lights in conjunction with your low-beam headlights to improve visibility.

Reduce Driving Speed

Driving in the mist is a time to slow down. Drivers need to be more careful when driving in misty conditions.

Use Defrosters and Windshield Wipers

The mist can cause moisture to accumulate on the windows and further reduce visibility. Defrosters and windshield wipers can help maintain clear visibility.

Maintain a Safe Following Distance

Keep a safe distance behind the vehicle in front to increase stopping distances. It gives you enough time to respond to any sudden stops or slowdowns.


Listen for Traffic Sounds

When driving in a dense mist, you can’t rely solely on your vision to keep yourself safe. You can listen for approaching sounds, like sirens or horns. This extra sensory input provides valuable information on the distance of vehicles.

Use Road Markings as a Guide

When visibility is reduced, road markings such as reflective road studs and lane lines can be a valuable guide. Use these road markings and stay within your lane to help you navigate in misty conditions.

Be Aware of Emergency Vehicles

Emergency vehicles, such as ambulances or police cars, may have to navigate fog to respond to an incident. Be alert to the sound of sirens or flashing lights and prepare yourself to give way if necessary.

Consider Exiting the Road if Visibility Becomes Unmanageable

Consider exiting the highway in extreme misty conditions where visibility is impossible. Find a safe place to wait for improved weather. Avoid accidents by pulling over into a rest area or parking space.

Check Weather Reports Before Traveling

Check the weather forecasts before you embark on your journey. This is especially important in mist-prone areas. The weather forecast helps drivers plan routes and make adjustments to travel time.


When driving in fog, you need to pay more attention and be extra cautious. You also have to adhere strictly to safety precautions. The driver can improve safety by understanding fog characteristics, the impact of the conditions on the road, and following some essential driving tips. Proactive measures, such as lowering speed or using road markers to guide you, can make driving in fog conditions safer. Drivers can reduce the risk of driving in fog by prioritizing their safety and remaining vigilant.