Return to blog

photo3_2It’s no secret that operators of heavy vehicles and machinery face unique challenges.

These may include:

  • Working in extreme weather conditions
  • Exposure to fumes and chemicals
  • Loud environmental noise

A panel at the Heavy Vehicle Safety Summit that took place in April of this year noted that a combination of training and technology are key to addressing the human aspect of these challenges. In a recent blog post, we talk about how to get your workers to adhere to your safety guidelines. But what about technology?

From a noise perspective, typically heavy equipment vehicles are built to operate within a 75 - 82dBA range depending on payload, road and the vehicle itself. As a point of reference:

  • A typical family vehicle will run between 40 and 60dBA,
  • Fire engines will have low to mid 80dBA noise levels,
  • Haul Trucks for Mining operations are around 90 dBA with combined two-way and satellite radio entertainment competing for a driver’s attention.
  • Military vehicles are even higher with an M1A1 Abrams tank running around 108 dBA or more, even 93 dBa at idle. (I know first-hand as a former M1A1 Tanker!)

These high noise levels make communications difficult—or impossible—for operators.

In these cases, ear-muffs or plugs are used to protect hearing, and headsets are used for communications. 2-way radios are generally used to provide communications between operators inside the vehicles and operations at base. How can a worker stay protected and still communicate while operating a heavy vehicle?

On top of this, entertainment is critical to safe and productive operation of heavy vehicles.

Long shifts coupled with repetitious job functions result in vehicle operator fatigue being a common problem, so operators use stereos or other audio entertainment devices to help combat and manage this.

The problem with the solution

Sensear-Blog-Image-1The problem with this scenario is that in order to hear the 2 way radio, stereos and other entertainment, operators will boost the volume of radio and communications equipment beyond safe levels. In fact, in order for operators to hear the person on the other end of the line speaking, or the music playing on the radio, the volume needs to be turned up significantly louder than any background noise—including the noise of the vehicle.

The technical term for what’s happening here is “auditory masking”. Auditory masking “occurs when the perception of one sound is affected by the presence of another sound.”

Essentially, when an operator is in the cab, the 75dBA cab noise interferes with standard audio coming from 2 way radios and stereo systems, which operate at 10dBA and higher. 

To hear those devices and communications, operators may do one of two things:

  • Take off any hearing protection they’re using (plugs or muffs), eliminating their safety effectiveness, or
  • Turn up the volume on the 2 way radio and stereo systems.

Either way, your operators are now exposing themselves to potentially harmful noise levels.

When you couple the vehicle noise with the additional noise of the two way radio and entertainment, the dB levels can rise past the safe levels dictated by OSHA. As the heavy vehicles operate in the 75-80dBA noise range, but to adequately hear the 2-way radio and entertainment noise is potentially increased 10-20dB louder than the background noise, resulting in in-cab sound levels from 85 to 95dB.

Sensear-Blog-Image-2The ideal solution would allow the operator hear the entertainment and 2-way radio communications in heavy vehicles, operate in the high noise environment of the vehicle, all the while maintaining safe noise exposure to the operator.

The only way to achieve this is by wirelessly routing the entertainment and 2-way radio audio directly through a headset to the operator. This means the entertainment and 2-way radio are played at a volume that is safe for the operator, within the headset, without having to compete with the noise in the cabin, reducing operator’s harmful noise exposure.

How does this help my heavy equipment operations?

First, the risk of hearing loss is significantly reduced as drivers are always protected. Since they can perform their job effectively with the headsets on, there is less temptation to remove them.

Operators of heavy equipment can perform their jobs safely and with less fatigue.

And secondly, communication is enhanced significantly, resulting in fewer cases of lost or inaccurate communication which can lead to truck backups and potentially dangerous consequences.

Are you interested in learning more about how you can reduce the risk of noise-related injuries, while improving the communication experience for your operators in heavy vehicles?

Contact us today at Sensear for more information.

  Download Sensear's 7 Degrees of Hearing Loss Infographic