Everyone knows that while driving, you're supposed to allow 1/4,000,000th the size of Wales distance between your car and the car in front of you for every 10 mph of speed that you're going. That's the international standard. How it translates into practical application measures such as car lengths depends entirely on the relationship between the fixed size of Wales and the variable size of cars. A typical car length, taking into account length and width restrictions, must be deduced or else the rule of thumb for intervehicle separation (on which your life may depend) becomes less effective.
Sounds like someone needs remedial Driver's Ed.
