Each day the driver and navigator team receives a set of course instructions that indicate every turn, speed change, stop, and start that the team must make throughout the day (usually 220 to 250 such instructions per day). Along the course route there will be from 4 to 7 checkpoints recording the exact time that the team passes that point. The objective is to arrive at each checkpoint at the correct time, not the fastest. The score for each team is the result of the team’s ability to follow the designated course instructions precisely. Every second off the perfect time (early or late) at each checkpoint is a penalty point. This format is much more mentally demanding than a flat-out cross-country race. Also, GPS or computers are not permitted and odometers are taped over. This is a test of human mental agility and endurance as well as classic car endurance, rather than programming capability. The course avoids timed segments on interstate highways, opting instead for scenic local, county, and state highways whenever possible through some of the prettiest country in the United States.