Variance in speed on interstates is a major contributor to accident rates. Variance involves both too fast and not fast enough. Towing well under the speed limit is not safer than towing at the limit, conditions allowing. Staying in the right lane unless passing is a good start, but I see way too many cars traveling slow in the left and middle lanes. What we all want to avoid are vehicles with high closing speeds and high speed lane changes. A vehicle in the right lane traveling well under the limit tends to result in high closing speeds for cars traveling at or slightly above the limit, which also tends to produce high speed lane changes. Too many drivers are driving distracted or in the wrong lane or while fatigued or under the influence. All of this stuff contributes to accidents. Traveling slow may reduce the risk of a single car accident but it may increase the likelihood of an accident on a stretch of road in certain conditions.