Why is driving on an expressway different from driving on an ordinary street?

• Expressways have lower speed limits.
• Expressways combine higher speed with heavy traffic, requiring you to drive faster and handle your vehicle more effectively.
  Explanation:

  "The higher speeds and volume of traffic on expressways require quicker thinking and more efficient vehicle handling compared to most other driving conditions."
• Expressways have a more "tailgating" tendency.
• Expressways have narrower lanes.