Actually there is a minimum speed on interstates. Here's a couple of links.
DOT
Quote:
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The Minimum Speed Rule prohibits a person from operating a motor vehicle at such a slow speed as to impede the normal and reasonable movement of traffic. However, in order to avoid a possible conflict with the basic speed rule, the law normally provides that a slow speed is permissible when "reduced speed is necessary for safe operation or in compliance with law." See Uniform Vehicle Code
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Wiki.
Quote:
25–30 mph (40–50 km/h) on residential streets
35–45 mph (55–70 km/h) on urban arterial roads
50–65 mph (80–105 km/h) on major highways inside cities
45–65 mph (70–105 km/h) on rural two-lane roads
55–70 mph (90–110 km/h) on rural expressways
65–75 mph (105–120 km/h) on rural Interstate highways
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As far as critical mass rides that would not be something to use as an example IMO. The affect and anger that goes with that last several days after they are complete.