To ensure the safety and security of the principal, security drivers and secure transportation providers should understand that all vehicles have inherent characteristics that decrease the performance of the vehicle, and create a dangerous scenario for the principal. One of those characteristics is the vehicle’s static stability factor (SSF).

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When a vehicle is approaching its limit of adhesion, a driver has two conflicting signals. The first signal is the steering wheel getting light, which means that it requires less effort to increase steering input (turn the steering wheel). The reason for this is that the adhesion the tire makes with the road is getting increasingly smaller – quickly.

The second signal is the vehicle load the driver feels at the back of the seat (their butt), which at the limit of adhesion is high.

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