Answer:
The underground railroad
Explanation:
The 'underground railroad' was known as such due to the slaves using it to escape and the people helping them to escape using secret codes that were commonly associated with railroads.
(Ex: 'station masters' = people who would hide slaves)
Pros: less accidents, Safety, you wouldn't have to wait for somebody to give you a ride
Cons: Its already hard enough for teens to get around, Teens are very distracted, age isn't the problem its their lack of responsibility
You would look for a blue sign that says food at the top and it would tell you how many miles to the left or to the right it will take to get to that restaurant, which will also include a bathroom, once you get off the expressway.