Features and Functions of Dash Cams: G Sensor, WDR, and Parking Mode

By Williams Logistics, Inc on 3-19-2024

Features and Functions of Dash Cams: G Sensor, WDR, and Parking Mode

As a semi-truck driver, safety is always a top priority on the road. With long hours spent behind the wheel and unpredictable conditions, having a dash cam installed in your truck can provide added security and peace of mind. However, there are often questions and confusion surrounding the various features and functions of dash cams. In this blog, we will answer three common questions that semi-drivers have about their dash cams: what is G sensor, what is WDR, and what is parking mode?

What is G Sensor in a Dash Cam?

One of the most important features of a dash cam is the G sensor. But what exactly is a G sensor and how does it work? In simple terms, a G sensor (or G-force sensor) is a component in the dash cam that measures the force of impact during a collision or sudden braking. When the G sensor detects a significant change in motion, it triggers the dash cam to automatically save the footage leading up to and following the event. This feature is crucial for providing evidence in the event of an accident or incident on the road. It can help determine fault, protect you from false claims, and assist in insurance claims. By having a dash cam with a G sensor, you can have peace of mind knowing that critical events are being recorded and saved.

What is WDR on a Dash Cam?

Another common question about dash cams is what is WDR? WDR stands for Wide Dynamic Range and is a feature that helps improve the clarity and quality of footage captured by the dash cam, especially in low-light or high-contrast situations. When driving at night or in bright sunlight, the camera may struggle to properly expose the image, resulting in dark or overexposed footage. With WDR, the dash cam is able to adjust exposure levels to produce a more balanced and detailed image. This can be especially beneficial for semi-truck drivers who often drive in various lighting conditions throughout the day. By having a dash cam with WDR, you can ensure that important details are captured clearly and accurately, making it easier to review footage and identify any potential issues.

What is Parking Mode on a Dash Cam?

Lastly, many semi drivers are curious about parking mode on dash cams. Parking mode is a feature that allows the dash cam to continue recording while the vehicle is parked and turned off. This feature can be useful for monitoring your truck when it is unattended, providing added security and protection against theft or vandalism. Some dash cams have motion detection sensors that can automatically start recording if any movement is detected nearby the vehicle. Additionally, some dash cams have a buffered recording feature that saves footage from before and after the event, ensuring that nothing is missed. By utilizing parking mode, you can have peace of mind knowing that your truck is being monitored even when you are not around.


In conclusion, dash cams are an essential tool for semi-truck drivers to enhance safety, security, and peace of mind on the road. Understanding the features and functions of your dash cam, such as G sensor, WDR, and parking mode, can help you maximize the benefits and protection it provides. By investing in a high-quality dash cam with these important features, you can drive with confidence and have reliable evidence in the event of unexpected incidents. Stay safe on the road!