They teach you in driver's education that you should match speed on the highway. Otherwise you impede the flow of traffic which causes far more problems.

Yup. If it gets too out of hand, they'll do a traffic break to slow everyone down. But going a significantly different speed than everyone else is something you try to avoid.

This is exactly what you should be doing. Matching speed with traffic is always the safest option. If you're going slower than everyone else, you're creating a hazard, almost as much as if you're weaving through traffic.