What is the rule of thumb for minimum interchange spacing in rural areas?

• A. 1 mile
• B. 2 miles
• C. 3 miles
• D. 4 miles

Answer: (B)

The rule of thumb for minimum interchange spacing in rural areas is typically established to ensure efficient flow of traffic and maintain safety on highways. Recognizing that rural highways generally have lower traffic volumes compared to urban settings, a spacing of 2 miles between interchanges is recommended. This distance allows for adequate acceleration and deceleration lanes, thereby improving the overall safety and operational efficiency of the road network.

By maintaining a minimum of 2 miles, drivers have enough distance to adjust their speeds and change lanes safely without causing disruptions to the flow of traffic. Spacing interchanges too closely in rural areas could lead to congestion and increase the likelihood of accidents. This practice aligns with transportation engineering guidelines, which advocate for adequate spacing to enhance roadway functionality in less densely populated areas.