How can a driver ensure that the cargo does not exceed weight limits?

Weighing the vehicle before and after loading at a certified scale is the most accurate method a driver can use to ensure that the cargo does not exceed the established weight limits. Certified scales provide precise measurements of the vehicle's total weight, including the load, which helps the driver verify compliance with legal weight restrictions set by federal and state regulations. This process is critical for safety, as overloading can lead to difficulty in controlling the vehicle, increased wear on tires and brakes, and potential penalties for violating weight laws.

The other options are less reliable. Estimating the weight by looking at the load is subjective and can easily lead to inaccuracies, as what may appear to be a manageable weight could actually be well above the legal limit. Monitoring the vehicle's speed while driving does not provide any information about weight and is irrelevant to ensuring compliance with weight regulations. Similarly, adjusting cargo without weighing it does not guarantee that the resulting weight will be within the permissible limits, as it relies on guesswork rather than accurate measurement.