Up to 85 percent of attacks on principals happen in or around a vehicle, says Greg Threatt of Threatt Protection Services in a recent Security article, What to Look for in Travel Security and Executive Protection Services. Threatt concludes that having a security-trained driver is paramount to a successful executive protection program. https://www.securitymagazine.com/articles/89269-how-to-choose-a-security-trained-driver-and-why-you-need-one