Weighing Vehicles

The safe operation of emergency vehicles depends in great part on the physical characteristics of the vehicle itself.  Total vehicle weight and weight distribution are an important component of these physical characteristics. 

As a result of the Risk Control survey there are indications that vehicles could potentially be overweight. Serious operational problems may occur as a result of an overweight condition or improper weight distribution.  Improper design and/or lack of proper engineering may also play a part in whether or not these vehicles are safe for operation.

To help ensure that these vehicles are safe for your operation under emergency response conditions, we recommend you review the Communiqué entitled “Overview of the Risks of Vehicle Conversions and Overweight Vehicles”.  Your organization may wish to utilize the self-evaluation tool, entitled “Conversion & Overweight Vehicle Information Form” to assist in documenting this evaluation.  This form can assist you in documenting whether or not the vehicle(s) in question are overweight or have improperly distributed weight.  If your organization determines that an overweight or improper weight distribution issue exists, you should take appropriate steps to make the vehicle safe for operation or to take it out of service.

As explained in the guide each vehicle should be weighed on each axle and have the actual weight is compared to the axle rating.  The total vehicle weight should then be compared to the Gross Vehicle Weight Rating provided by the manufacturer.  Vehicles should be weighed fully loaded with equipment, water and at least consideration for a full passenger load.  The vehicle should be weighed as follows:

• Front axle weight
• Rear axle(s) weight
• Combined weight

Also consider taking additional weight readings for the vehicles as follows:

• Right side (front and rear combined)
• Left side (front and rear combined)

Available Resources

• Conversion and Overweight Vehicle information Form
• Conversion and Overweight Vehicle Risks