The correct answer to a pack of vehicles going the speed limit is to slow down and follow from a safe distance. Constantly passing slower traffic at 90 is way more dangerous. Driving at 90 makes you much more likely to get in an accident. Crashing at 90 increases the risk of a fatal accident by an order of magnitude than crashing at 60.90 mph by myself is safer than being in a NASCAR style wreck if someone in the slower pack of vehicles makes a mistake. All it takes one idiot not paying attention to cause a big accident.
Trust me, cruising at 90 is very safe especially if traffic is very light.
Situational awareness is very important on the highway at any speeds.
Both the risk of crashing and the risk of serious injury and death increase as speeds increase. Driving faster than the average speed increases the risk of crash as well and the risk scales up the bigger the difference. The science here has been clearly demonstrated since the 1950s.
https://safety.fhwa.dot.gov/speedmg... - The Relation Between Speed and Crashes.pdf
The money quote:
The exact relation between crashes and speed depends on a large number of factors. In general
however, the relation is very clear and has been shown in a large number of studies: the higher the
speed, the greater the probability of a crash. At the same percentage increase in speed, the crash rate
on rural roads increases more than the crash rate on urban roads. The crash rate is also higher for an
individual vehicle that drives faster than the other traffic on that road.