I dare them to try that on I-40 east and west of Albuquerque. Curves and hills challenge auto drivers with slow trucks and fast drivers exceeding the 75 mph speed limit. A couple of weeks ago a wrong-way driver near the Indian casino west of ABQ killed two. The area west of ABQ to the state line has Indian pueblos and reservation land on both sides of the highway and Gallup has an extreme number of drunk drivers who are unpredictable when on the road.
Dallas and Houston have some very tough squirrely high speed interstate sections with people driving like wild yahoos in heavy traffic. THEY ARE NUTS!! These things will only be semi-safe past Conroe heading north on 45 to Dallas and about 30 minutes south of Dallas while on 45 heading to Houston.
Houston to Dallas on I45 is like a Talladega race... this would be a real test for FedEx.