Pick up hitchhikers. They are great company and always make the drive safer. Apply liberal use of racial profiling for best effect. The scrawny white guys have the best weed, this is great when you want to sleep at the wheel. The angrier looking white guys have the best amphetamines, these are great for when you want to get in a long stint at the wheel. Indians and Mexicans are useful at food breaks. They get discounts as their cousins always work there. Asians aren't much use unless you need help calculating distances along the way, so just pass them by, the walk will do them good anyhow. Black guys make the scariest stick up kids, so pick them up when you are nearing a gas station, then you get free gas, free candy, and a little bit of extra money to pay for the audio books. Avoid Arabs - they'll blow your car up.