Unless otherwise posted, the speed limit is __ on streets and highways.
Answers
70 mph
55 mph
45 mph
30 mph
The correct answer and explanation is:
The correct answer is 55 mph.
Explanation:
In the United States, unless otherwise posted, the speed limits on streets and highways are typically set based on the type of road, surrounding environment, and the specific regulations of the state or locality. However, there is a general assumption for urban and rural roads when no specific speed limit is posted.
- Urban Streets and Residential Areas: In many places, the default speed limit in residential neighborhoods or urban streets is 25 to 35 mph, reflecting the increased risk of pedestrians, cyclists, and local traffic.
- Rural or Non-Residential Areas: For rural roads or areas outside of urbanized zones, the default speed limit is generally higher. In many states, 55 mph is a common default speed limit on rural highways, unless posted otherwise. This reflects the balance between safety and efficient traffic flow, especially when there are fewer pedestrians or obstructions.
- Interstate Highways: On interstate highways, the default speed limit can be higher. For example, the default speed limit on interstates in many states is 65 mph or 70 mph. However, even on highways, there are some local variations where states may post specific speed limits.
Why 55 mph is the Answer:
The 55 mph speed limit was a nationwide standard set in 1974 as part of the Energy Policy and Conservation Act, which was enacted to reduce fuel consumption during the oil crisis. While the law was repealed in 1995, the 55 mph limit remained the default on many rural highways and roads in several states.
Though modern speed limits vary by region and road type, 55 mph still represents a common, default speed limit for many rural and less-developed highways unless posted differently. The other options (70 mph, 45 mph, and 30 mph) typically represent specific conditions or local regulations, not a default speed limit.