The one man ATM vans were one of the reasons I left. They did have some additional security features but they tended to malfunction. The vans would shut down after about a quarter mile if you didn't enter the security code in after a stop. However the truck gave no feedback to if the code you entered was correct or not. So you'd think you had entered the correct code but if you unknowingly made a mistake the truck would shutdown on you in the middle of the road and had to be reactivated via satellite. This was done by the same company that dismissed putting GPS on all the trucks was too expensive but installing non weatherproof cameras all over the trucks was a great idea.