Items from a page torn out of a Massachusetts Drivers' Manual:
"Following Distance: to calculate a safe following distance, leave six inches between your car and the car in front of you for every ten miles per hour of speed. For example, at 10 mph, leave six inches, at 20, 12,...at 50, leave 30. In conditions of ice, rain or poor visibility, or heavy traffic these distances should be cut in half."
"Approaching an intersection where you have a stop sign and traffic on the other road has the right of way, if a string of cars is going by, two car-lengths apart, but there's a quarter-mile gap behind the last car, run the stop sign to cut into the string. Do not wait for the huge, safe gap."
Yep. It's Vacation Week.