"In spite of high speeds, the interstate system is the safest of our highway system. Nearly two people die for every 100 million miles traveled on other highways, compared to less than one person for every 100 million miles traveled on the interstates. Everything on the Interstate System is intended to protect your life. Guide rails on hazardous stretches, berms or concrete dividers in the median, landscaping that screens oncoming lights, breakaway signs and lampposts all save lives."
LinkLooking at those statistics Interstates are twice as safe, but we still do rural highways. For one thing driving a 9000 pound pickup is many times safer than a 2000 pound auto. Heavier is safer, it's just physics of collisions. Plus we have a heavy brush guard and a special rear collision cushion in back.
