If drivers were made to pay for road use according to the amount of time they spent on the road, they would drive more dangerously. Experiments were conducted with volunteers using a driving simulator. In the first experiment, the volunteers were charged for time spent driving below 10mph in order to see how people coped with trying to avoid congestion. In the second experiment, they were charged for the time spent in a particular area. The results were alarming. The volunteers in the first experiment jumped many red lights in an attempt to keep their speed up. Those in the second frequently broke the speed limit, and overtook in dangerous situations. In the interests of road safety, we should not introduce such payment schemes.