Understanding Wig Wags: A Comprehensive Guide for CDL Drivers

In the world of commercial driving, understanding the various components of a vehicle’s safety systems is crucial. One such component is the wig wag, a device that plays an essential role in the air brake systems of large trucks. This guide aims to provide an in-depth understanding of wig wags, their types, functionality, and importance in ensuring safe driving practices.

Comparison Table of Wig Wag Types and Applications

Type	Description	Common Applications	Legal Status
Low Air Pressure Wig Wag	Signals low air pressure by dropping a mechanical arm	Commercial trucks, buses	Varies by state
Manual Wig Wag	Requires manual reset after activation	Trucks, some emergency vehicles	Varies by state
Automatic Wig Wag	Automatically resets when pressure is restored	Commercial trucks	Varies by state
Light-Rail Wig Wag	Alerts when light-rail trains are approaching	Light-rail systems, school buses	Typically legal

What is a Wig Wag?

A wig wag is primarily a low air pressure warning device found in the braking systems of large commercial vehicles. It activates when air pressure in the braking system drops below 60 psi, alerting the driver to a potentially dangerous situation. When activated, a mechanical arm drops into the driver’s line of sight, ensuring that the driver is aware that the air pressure is insufficient to safely operate the brakes.

Types of Wig Wags

Low Air Pressure Wig Wags

Low air pressure wig wags are the most common type found in commercial trucks. They are designed to provide a visible warning when the air pressure in the brake system falls below the necessary threshold for safe operation. This feature is crucial for preventing brake failure, which can lead to serious accidents.

Manual vs. Automatic Wig Wags

Wig wags can be categorized into manual and automatic types. Manual wig wags must be reset by the driver once the air pressure is restored, while automatic wig wags will reset themselves when the pressure returns to a safe level. This distinction is important for drivers to understand, as it affects how they interact with the vehicle’s safety systems.

Application in Light Rail and Other Vehicles

While wig wags are primarily associated with commercial trucks, they also serve important functions in light-rail systems and some emergency vehicles. In these applications, wig wags help alert motorists and pedestrians to the presence of oncoming trains or vehicles, enhancing overall safety in various transportation contexts.

Technical Features of Wig Wags

Feature	Low Air Pressure Wig Wag	Manual Wig Wag	Automatic Wig Wag
Activation Pressure	Below 60 psi	Below threshold	Below threshold
Reset Mechanism	Automatic	Manual	Automatic
Visibility	Mechanical arm drops	Manual operation	Self-rising
Common Use	Trucks, buses	Trucks	Commercial vehicles

Importance of Wig Wags in CDL Training

Understanding wig wags is essential for anyone pursuing a Commercial Driver’s License (CDL). The presence of these devices is often covered in CDL training materials and exams, such as those found on www.dmv-written-test.com and uniontestprep.com. Knowledge of how these devices work can significantly enhance a driver’s ability to respond to low air pressure situations, thus improving safety on the road.

Related Video

Conclusion

Wig wags play a vital role in the air brake systems of commercial vehicles by providing crucial warnings about low air pressure. Understanding their functionality, types, and applications is essential for CDL drivers to ensure safety on the road. By familiarizing themselves with wig wags and their operation, drivers can better protect themselves and others while operating large vehicles.

FAQ

What is a wig wag?
A wig wag is a warning device used in the braking systems of large trucks to signal low air pressure. It drops a mechanical arm into the driver’s view when pressure falls below a safe threshold.

How does a low air pressure wig wag work?
It activates when the air pressure drops below 60 psi, providing a visual alert to the driver that the brakes may not function properly.

Are wig wags required in all states?
The legality of wig wags varies by state. Some states allow them on school buses and motorcycles, while others have different requirements.

What is the difference between manual and automatic wig wags?
Manual wig wags require the driver to reset them once pressure is restored, whereas automatic wig wags reset themselves when the air pressure returns to a safe level.

In which vehicles are wig wags commonly found?
Wig wags are primarily found in commercial trucks but can also be used in light-rail systems and some emergency vehicles.

What happens when the air pressure in a vehicle is too low?
When air pressure is too low, the wig wag activates, alerting the driver that the brakes may not work effectively, which can lead to unsafe driving conditions.

How can CDL training help with understanding wig wags?
CDL training includes information about the operation and importance of wig wags, preparing drivers to respond appropriately in situations involving low air pressure.

What should a driver do if the wig wag activates?
If the wig wag activates, the driver should safely pull over and check the air pressure system, addressing any issues before continuing to drive.

Can wig wags be installed in vehicles that don’t have them?
Yes, wig wags can be added to some vehicles, but it’s important to check state regulations and ensure proper installation.

Where can I learn more about wig wags and CDL requirements?
Resources such as cdl-prep.com and truckingtruth.com provide valuable information on wig wags and other CDL-related topics.